• Guerrilla Gardening Day

    1 May

    International Guerrilla Gardening Day is observed on 1 May, encouraging participants to cultivate sunflowers or suitable alternative plants in their regions. Guerrilla gardening involves growing plants on land without legal permission, often on neglected or abandoned sites, aiming to enhance environmental quality and aesthetics. The practice has historical roots with figures like Gerrard Winstanley and John Chapman and was popularised by the Green Guerrilla group in 1973. This day was established in 2007 by gardeners in Brussels and is recognised in over 30 countries, including Australia, where local adaptations and legal initiatives coexist with the guerrilla gardening spirit.

  • May Day

    1 May

    May Day, observed on 1 May, is a significant cultural and labour-related event celebrated worldwide. It originates from ancient Celtic festivals marking spring and fertility, including customs like dancing around maypoles and decorating with flowers. The day also became internationally recognised as a workers’ rights celebration, advocating for the eight-hour workday. In Australia, May Day traditions are linked to early labour movements, with annual marches and events supporting workers’ rights and social justice. The festival combines folkloric spring rituals with the commemoration of labour achievements.

  • International Pilates Day

    2 May 2026

    International Pilates Day is observed on the first Saturday of May to honour the legacy of Joseph Pilates, who believed in the transformative power of physical fitness. The day promotes mindful and purposeful movement, uniting Pilates studios and practitioners worldwide. It emphasises accessibility, education, and community, with events held in over 50 countries. Modern evolutions like FS8 combine Pilates, toning, and yoga to offer inclusive and effective workouts suitable for all bodies and fitness levels. The day also highlights Pilates’ integration into physical education and rehabilitation programs, particularly in Australia.

  • Mothers Who Lost Children Day

    3 May 2026

    The International Day for Mothers Who Have Lost Children is observed on the first Sunday of May each year. Originating in Australia through Carley Marie Dudley, it recognises mothers grieving the loss of children due to stillbirth, miscarriage, sudden infant death syndrome, or other causes. The day provides a space for mothers to share their experiences, memories, and emotions openly. It aims to break the stigma surrounding child loss and support healing through acknowledgement and community. The observance honours the enduring pain of loss and the identity of mothers despite their children no longer being present.

  • Wild Koala Day

    3 May

    Wild Koala Day is observed annually on 3 May in Australia to highlight the importance of conserving wild koalas. Established in 2016 by independent koala conservation groups, the day promotes awareness of koalas’ unique biology and the threats they face. Koalas are arboreal marsupials native to coastal regions of eastern and southern Australia, primarily feeding on eucalyptus leaves. The species is listed as vulnerable due to habitat loss, urbanisation, and other environmental pressures. Activities on Wild Koala Day include tree planting, fundraising, and educational events to support koala protection.

  • International Firefighters' Day

    4 May

    International Firefighters’ Day is observed annually on 4 May to honour firefighters who protect lives, property, and ecosystems from fire. Established following the tragic deaths of five Australian firefighters in a 1998 forest fire, the day commemorates their sacrifice and recognises the professionalism and bravery of firefighters globally. The date coincides with the feast day of Saint Florian, the patron saint of firefighters. Activities include memorial ceremonies, educational events, and public awareness campaigns on fire safety.

  • International Disability Rights Day

    5 May

    International Disability Rights Day is observed annually on 5 May to raise awareness about the rights of people with disabilities and combat discrimination. Originating in 1992 with coordinated actions across 17 European countries, the day focuses on equal rights in employment, education, and accessibility. The United Nations Convention on the Rights of Persons with Disabilities, effective since 2008, supports full participation and legal protection for people with disabilities. In Australia, disability rights are supported through legislation, national strategies, and the National Disability Insurance Scheme.

  • Sleep Apnoea Awareness Day

    5 May

    Sleep Apnoea Awareness Day is observed annually in Australia on 5 May to increase understanding of sleep apnoea, a disorder characterised by repeated breathing interruptions during sleep. Symptoms include snoring, fatigue, and concentration difficulties, often unnoticed by sufferers but observed by partners. Causes range from nasal congestion to neurological issues, with risk factors including genetics and obesity. Treatments vary from lifestyle changes to CPAP therapy, invented by Australian doctor Colin Sullivan. The day is organised by Sleep Apnoea Australia to promote education and support.

  • International No-Diet Day

    6 May

    International No-Diet Day is observed annually on 6 May, originating in 1992 in the United Kingdom. Founded by Mary Evans Young, the day challenges diet culture and promotes body acceptance and healthy living at any size. It highlights the dangers of restrictive diets and eating disorders while opposing weight-based discrimination. The day is symbolised by a light blue ribbon and is supported internationally, including by feminist groups and health organisations in Australia. It honours those who have struggled with eating disorders or weight-related surgeries.

  • Cosmopolitan Cocktail Day

    7 May

    Cosmopolitan Cocktail Day is celebrated every 7 May, recognising the iconic vodka-based cocktail classified as a modern classic by the International Bartenders Association. Originating from New York, the drink gained popularity through media exposure and is known for its light pink colour and refreshing taste. The cocktail combines vodka, triple sec, lime, and cranberry juice, often garnished with lime or cranberry. In Australia, the day is marked with special events and promotions in bars, especially in Sydney and Melbourne.

  • Amyloidosis Awareness Day

    8 May

    Amyloidosis Awareness Day is observed annually in Australia on 8 May to increase understanding of amyloidosis, a group of rare diseases caused by abnormal protein deposits called amyloids. The condition affects various organs, commonly the kidneys and heart, and can lead to serious complications. Diagnosis often requires tissue biopsy due to nonspecific early symptoms. Treatment focuses on preventing new amyloid formation and managing symptoms, as no cure or removal method exists. The day was established in 2016 by Trisha Gardiner-Wilson in memory of her husband Adam, who died from amyloidosis.

  • Goku Day

    9 May

    Goku Day is celebrated on 9 May to honour Son Goku, the main character of the Dragon Ball franchise created by Akira Toriyama. The franchise includes manga, anime, video games, and more, inspired by martial arts and classic literature. Established by Bird Studio and certified by the Japanese Association of Commemorative Dates, the day features events worldwide, including in Australia. Fans gather for cosplay, exhibitions, and discussions, promoting Japanese animation and culture.

  • Mother's Day

    10 May 2026

    Mother’s Day is celebrated on the second Sunday of May in over eighty countries, including Australia and the United States. The tradition began in the USA in 1908, initiated by Anna Jarvis to honour her late mother. The day is marked by giving flowers, cards, and gifts to mothers and maternal figures. In both the USA and Australia, carnations are symbolic flowers worn to represent living and deceased mothers. The holiday has a strong family focus and includes various cultural and charitable activities.

  • Clean Room Day

    10 May

    Clean Room Day is an unofficial annual event held on 10 May that promotes cleanliness and hygiene in residential spaces. It symbolises the spring tradition of tidying and discarding old items, a practice common across many cultures. The day encourages family participation, often accompanied by music and themed activities, to make cleaning both beneficial and enjoyable. Psychologists highlight that maintaining order in the home positively impacts mental health. In Australia, spring cleaning occurs during September to November, with an emphasis on eco-friendly methods and community involvement.

  • Stomach Freedom Day

    11 May

    Stomach Freedom Day, observed annually on 11 May, invites people to enjoy food without restrictions, promoting freedom from dieting trends. Originating from American creators Thomas Roy and his wife Ruth, the day encourages trying new foods or indulging in favourites. In Australia, the celebration is popular among barbecue lovers and features special menus in Melbourne and Sydney. The day also highlights the importance of stomach health and balanced eating habits.

  • Chronic Fatigue Syndrome Awareness Day

    12 May

    Chronic Fatigue Syndrome Awareness Day is observed annually on 12 May to raise awareness about ME/CFS, a condition characterised by prolonged fatigue not relieved by rest. Symptoms include apathy, mood decline, muscle weakness, and sleep disturbances. The syndrome affects people of all ages and backgrounds, with a higher prevalence among women and those in high-responsibility professions. Diagnosis is challenging due to symptom overlap with other illnesses. Treatment involves a comprehensive approach focusing on rest, physical activity regulation, and supportive therapies.

  • World Cocktail Day

    13 May

    World Cocktail Day is observed on 13 May to commemorate the first published definition of a cocktail as an alcoholic beverage. The term cocktail generally refers to mixed drinks combining spirits with various mixers such as bitters, juices, and syrups. The original definition appeared in The Balance and Columbian Repository in 1806, describing a cocktail as a stimulating liquor made from spirits, sugar, water, and bitters. The day encourages the celebration of cocktail culture alongside responsible alcohol consumption. In Australia, the day coincides with National Cocktail Day and is marked by events promoting both local and international cocktail traditions.

  • Chihuahua Appreciation Day

    14 May

    International Chihuahua Appreciation Day is observed annually on 14 May to celebrate the Chihuahua dog breed. Originating from the Mexican state of Chihuahua, this breed is known as the smallest recognised dog breed by some kennel clubs. The breed descends from the ancient Techichi dogs bred by the Toltec culture. The day was established by Nadia Alterio in 2011 to honour her Chihuahua and promote the breed worldwide. In Australia, Chihuahuas are popular urban pets, with local clubs and veterinary organisations supporting their care and health.

  • Ascension of Christ

    14 May 2026

    The Ascension of Christ is a Christian feast celebrating Jesus Christ’s ascent to heaven 40 days after his resurrection. It marks the conclusion of Jesus’ appearances to his disciples and the beginning of his heavenly ministry. This event is closely linked with the promise of the Holy Spirit and the festival of Pentecost. The Ascension affirms both the humanity and divinity of Jesus and his ongoing role in the spiritual life of believers. It is observed in various Christian denominations with special liturgies, prayers, and processions.

  • Conscientious Objectors Day

    15 May

    International Conscientious Objectors Day is observed annually on 15 May to recognise individuals who refuse military service due to moral or religious beliefs. Established in 1981 during a meeting in Copenhagen, the day highlights the historical persecution of conscientious objectors, notably under Nazi military justice. The German Bundestag’s 1997 resolution condemned Nazi-era sentences against objectors as unjust. Memorials, such as the one at Buchenwald concentration camp, commemorate those who suffered or died for their stance. The day also draws attention to the legal recognition and protection of conscientious objection in many countries, including Australia.

  • International Day of Light

    16 May

    The International Day of Light, observed annually on 16 May, recognises the importance of light in various fields including science, culture, medicine, and sustainable development. Established by UNESCO in 2017, the day honours the first successful laser demonstration by Theodore Maiman in 1960. The celebration promotes awareness of light-based technologies and their contributions to education, communication, and energy efficiency. It also supports the United Nations’ sustainable development goals and encourages the preservation of cultural heritage through light technologies.

  • International Day of Peaceful Coexistence

    16 May

    The International Day of Peaceful Coexistence, proclaimed by the United Nations General Assembly on 16 May, encourages tolerance, solidarity, and mutual understanding among diverse peoples. It is based on principles of respecting differences and resolving disputes through peaceful negotiations in line with international law. The day supports efforts to maintain unity amid cultural and religious diversity and aligns with the UN’s Sustainable Development Goal 16 for peace and justice. Member states are urged to hold educational activities to promote a culture of peace and non-violence worldwide.

  • Pinot Grigio Day

    17 May

    Pinot Grigio Day is celebrated every 17 May to recognise the popular Italian white wine style made from the Pinot Gris grape. Originating from France, the grape is known as Pinot Grigio in Italy and produces a light, refreshing wine with citrus and green apple flavours. The day was established by the Cavit company, a sustainable winery founded in 1957 in Trentino, Italy. Pinot Grigio pairs well with seafood, pasta, and poultry dishes, making it a versatile choice for many meals.

  • Marshmallow Day Australia

    18 May

    Marshmallow Day in Australia is observed on 18 May, primarily in Melbourne. The marshmallow confection is made from sugar, water, and gelatin whipped into a fluffy foam, containing about half air for its soft texture. Its name derives from the marshmallow plant, originally used in early recipes. The sweet has evolved from a labour-intensive French dessert to a mass-produced treat enjoyed in various forms, including toasted over fires and as a key ingredient in desserts and snacks.

  • World Family Doctor Day

    19 May

    World Family Doctor Day is celebrated annually on 19 May to emphasise the importance of family medicine in healthcare. Established in 2010 by the World Organisation of Family Doctors (WONCA), the day honours the work of general practitioners who provide comprehensive, long-term care. Family medicine is a primary healthcare specialty that addresses a wide range of acute and chronic conditions. In Australia, general practitioners undergo extensive training and receive Medicare subsidies, reflecting their essential role in the health system.

  • World Bee Day

    20 May

    World Bee Day is celebrated annually on 20 May to recognise the essential role of bees in pollination and agriculture. Established by the United Nations General Assembly in 2017, the date honours Anton Janša, a pioneer of modern beekeeping. Bees contribute significantly to the pollination of crops and wild plants, supporting food production and biodiversity. The day raises awareness of threats to pollinators and promotes sustainable agricultural practices to protect them.

  • International Tea Day

    21 May

    International Tea Day, officially designated by the United Nations General Assembly on 21 May, honours tea as one of the world’s most popular beverages. Originating from regions in China and Myanmar, tea has a history spanning approximately 5000 years and holds cultural importance in Southeast Asia. The tea industry supports millions of livelihoods and is sensitive to climate change, affecting production and economies. Australia participates in the celebration with local cultivation and festivals promoting tea appreciation.

  • World Cultural Diversity Day

    21 May

    World Cultural Diversity Day, observed annually on 21 May, was established by the United Nations General Assembly in 2002 to promote the value of cultural diversity for dialogue and development. Originating from UNESCO’s 2001 Universal Declaration on Cultural Diversity, the day highlights the importance of preserving cultural heritage and fostering intercultural understanding. It addresses threats such as cultural marginalisation, language loss, and the impact of globalisation. The day encourages global cooperation to support cultural rights, creativity, and sustainable development.

  • Safe Routes to School Day

    22 May 2026

    Safe Routes to School Day is an annual campaign held on the fourth Friday of May across Australia. Initiated in 1999 in New South Wales and nationally recognised since 2004, it encourages primary school students to walk to school. The campaign promotes road safety, healthy lifestyles, and environmental protection. Supported by government bodies and health organisations, it emphasises safe pedestrian behaviour and reducing car and public transport use for school trips.

  • International Biodiversity Day

    22 May

    International Biodiversity Day is observed annually on 22 May to promote awareness of biological diversity and its conservation. Established by the United Nations General Assembly in 2000, the day honours the adoption of the Convention on Biological Diversity. Biodiversity encompasses the variety of life forms and their ecological interactions. Australia is a party to the Convention and related protocols, with significant biodiversity protected under national legislation and recognised through UNESCO World Heritage sites.

  • World Turtle Day

    23 May

    World Turtle Day is observed annually on 23 May to highlight the conservation needs of turtles worldwide. Established in 2000 by the American Tortoise Rescue, the day focuses on threats such as habitat destruction, accidental capture, climate change, and plastic pollution. Marine turtles have existed for over 100 million years but face increasing risks, with several species listed as endangered or vulnerable. In Australia, World Turtle Day supports local conservation initiatives, including habitat protection and community volunteer programs.

  • Empire Day

    24 May

    Empire Day was a globally observed celebration held on 24 May to honour the British Empire and the birthday of Queen Victoria. Established after her death in 1901, the day aimed to promote patriotism and strengthen ties within the empire. New Zealand officially recognised Empire Day in 1903, where it reflected national identity and imperial connections. Over time, the day lost prominence and was replaced by Commonwealth Day in 1958. Today, Empire Day is largely forgotten but remains a historical symbol of the British Empire’s legacy.

  • Pentecost

    24 May 2026

    Pentecost, also known as Trinity Sunday, is a significant Christian festival observed on the fiftieth day after Easter. Originating from the Greek term meaning ‘fiftieth,’ it marks the descent of the Holy Spirit on the Apostles and the beginning of the Christian church’s mission. The festival has roots in the Jewish harvest celebration known as Shavuot, which commemorated the wheat harvest and the giving of the Law to Moses. In Christian tradition, Pentecost is associated with red liturgical colours symbolising the Holy Spirit and martyrdom. It is a common day for baptisms and confirmations across various Christian denominations.

  • Queen Victoria's Birthday

    24 May

    Queen Victoria was born on 24 May 1819 at Kensington Palace in London. She ascended the British throne at age 18 and reigned for over 63 years, shaping the Victorian era. Her birthday became an official public holiday in Canada from 1901 and was historically celebrated in Australia, especially in the state of Victoria named in her honour. The day symbolised imperial unity and was marked by patriotic ceremonies, parades, and public events. Victoria’s legacy includes the establishment of modern monarchy traditions and influence on numerous European royal families.

  • World Tarot Day

    25 May

    World Tarot Day is celebrated annually on 25 May to recognise tarot practitioners and their craft. Established in 2003 by American tarot master Dan Elder, the day aims to counter negative perceptions and highlight the professional nature of tarot reading. Tarot cards, originating in the 14th century, have evolved from gaming tools to instruments of divination and meditation. In Australia, the day features seminars, workshops, and public events that explore tarot’s history and applications, reflecting a growing interest in tarot among diverse communities.

  • Whit Monday

    25 May 2026

    Whit Monday, also known as Pentecost Monday, is observed the day after Pentecost, commemorating the descent of the Holy Spirit on Jesus Christ’s disciples. It marks the 51st day after Easter and is associated with the birth of the Christian Church. The celebration includes symbols such as white colour, flame, wind, God’s breath, and doves. While not a public holiday in Australia, many Christian churches hold special services and decorate with white and red flowers. The Orthodox Church in Australia observes Whit Monday according to the Julian calendar.

  • National Sorry Day

    26 May

    National Sorry Day is observed annually on 26 May in Australia to acknowledge the forced removal of Aboriginal and Torres Strait Islander children from their families. Established in 1998, the day highlights the policies that operated from 1869 to 1969, which led to the Stolen Generations. These children were taken without evidence of neglect or abuse and placed in institutions where many suffered hardship and abuse. The day serves to recognise the profound negative effects on individuals, families, and communities. It also marks the beginning of National Reconciliation Week.

  • Sun Protection Awareness Day

    27 May

    Sun Protection Awareness Day is observed annually on 27 May to raise awareness about the effects of ultraviolet (UV) radiation on skin health. UV rays can penetrate clouds and cause sunburn, premature skin ageing, and skin cancer. In Australia, where UV exposure is intense, strict sun safety measures are in place, including school hat policies and public campaigns like Slip! Slop! Slap!. Dermatologists participate by offering free screenings and educational activities to promote skin cancer prevention.

  • Brunette Day

    28 May

    Brunette Day is an unofficial holiday celebrated primarily on 28 May to honour dark-haired women. Its origins are unknown, but it is believed to have emerged as a counterpart to Blonde Day, which began in 2006. Dark hair is often associated with traits such as practicality, restraint, and wisdom, contrasting with stereotypes about light hair. The day has gained popularity, with various events including awards for outstanding brunettes in business and fashion. In Australia, where many people have dark hair, the celebration is reflected in cultural advertising and the prominence of famous brunettes.

  • World Digestive Health Day

    29 May

    World Digestive Health Day is observed annually on 29 May to highlight digestive health issues and promote effective prevention and treatment methods. Established on the anniversary of the World Gastroenterology Organisation’s constitution in 1958, the day focuses on raising public awareness about digestive disorders affecting a significant portion of the population. Key factors contributing to digestive problems include poor diet, harmful habits, and stress. Activities involve healthcare institutions providing education, consultations, and diagnostic services to encourage healthier digestive practices.

  • National Scone Day

    30 May

    National Scone Day is observed annually on 30 May to celebrate scones, a traditional British baked good. Scones are made from wheat or oat flour and can be sweet or savoury, with popular varieties including raisin, pumpkin, cheese, and potato scones. Originally cooked on a griddle and served in triangular portions, modern scones are baked with leavening agents and come in various shapes. They are commonly enjoyed with cream and jam during traditional British tea services such as Cornish or Devonshire cream tea. Regional variations exist in Australia, New Zealand, and Scotland, reflecting local tastes and ingredients.

  • World No Tobacco Day

    31 May

    World No Tobacco Day is an international observance established by the World Health Organization in 1988 to raise awareness about the health risks of tobacco use. It is held annually on 31 May and forms part of seven health-related days promoted by WHO. Tobacco use is the leading preventable cause of death globally, contributing to over 8 million deaths each year, including those from secondhand smoke. The day focuses on educating the public about tobacco’s harms and encouraging effective tobacco control policies. Australia has implemented some of the strictest tobacco regulations, including plain packaging laws and bans on tobacco advertising.

  • Blondes Day

    31 May

    Blondes Day is observed annually on 31 May, originating from efforts to challenge stereotypes about blondes. The celebration includes parades, contests, and social campaigns, particularly in Australia where it promotes awareness and diversity. The day also features beauty promotions and community events. Scientific studies note a decline in natural blondes globally, with Finland having the highest concentration. The event fosters positive recognition and combats discrimination against people with light hair.

  • Trinity Sunday

    31 May 2026

    Trinity Sunday is a significant feast in Western Christianity, celebrated on the Sunday following Pentecost. It honours the Christian doctrine of the unity of God in three Persons: the Father, the Son, and the Holy Spirit. The day holds the highest liturgical rank in the Roman calendar and is marked by priests wearing white vestments. Observed by Roman Catholic, Anglican, Lutheran, Presbyterian, Methodist, and many Baptist churches, the celebration includes traditional trinitarian gospel readings and catechesis on the doctrine of the Trinity.