May 15, 2026, is the 135th day of the year, with 230 days remaining, and it falls on a Friday — the third Friday of May — in the nineteenth week of the year.
With 26 national and international days on the calendar, May 15 is the third Friday in May and one of the busiest dates of the month, anchored by the International Day of Families, National Endangered Species Day, Peace Officers Memorial Day, and National Chocolate Chip Day, with ten observances falling here specifically because it’s the third Friday: NASCAR Day, National Bike to Work Day, National Pizza Party Day, and the O. Henry Pun-Off World Championships among them. Las Vegas was also founded on this date in 1905.
National Days on May 15
All national & international days celebrated today
26 celebrations on this dayInternational Day of Families
Proclaimed by the UN General Assembly in 1993 and observed on May 15 since 1994, the International Day of Families highlights the importance of families as the fundamental unit of society. Each year carries a specific theme addressing challenges such as poverty, inequality, digital literacy, and intergenerational support.
National Endangered Species Day
Established by the US Senate in 2006, National Endangered Species Day raises awareness of the thousands of plant and animal species threatened with extinction and celebrates the successes of conservation efforts. The Endangered Species Act of 1973 has prevented the extinction of 99% of species listed under its protection.
National Chocolate Chip Day
Ruth Wakefield accidentally invented the chocolate chip cookie at the Toll House Inn in Whitman, Massachusetts in 1938 — she chopped a Nestlé chocolate bar into her butter drop cookies expecting it to melt, and instead created one of the most beloved baked goods in history. National Chocolate Chip Day celebrates the humble chip itself.
Peace Officers Memorial Day
Established by Congress in 1962 and proclaimed annually by the President, Peace Officers Memorial Day honours law enforcement officers killed or disabled in the line of duty. It falls within National Police Week (May 11–17) and is marked by ceremonies at the National Law Enforcement Officers Memorial in Washington D.C.
Here’s every observance celebrated on May 15, 2026.
National & International Days on May 15
Whether you’re cycling to work, eating pizza, honoring a peace officer, bringing flowers to someone, wearing a straw hat, making your worst pun in Austin, Texas, or celebrating families in all their forms, here’s the story behind each of these May 15 celebrations.
Asphalt Day
Asphalt Day acknowledges the crucial role of asphalt in our lives from paving roads and runways to protecting homes through roofing materials. The day was launched by the Asphalt Institute, a century-old trade association, to recognize the importance of this material and the professionals behind it. Michelle Lowe, the Institute’s Marketing and Membership Director, emphasized that most people interact with asphalt daily without even realizing it.
Break the Glass Ceiling Day
Break the Glass Ceiling Day is held annually on May 15—the 135th day of the year—this day draws attention to systemic barriers that prevent women and underrepresented communities from achieving workplace equality. The phrase “glass ceiling” has been in use since the 1970s, but the observance is relatively new. It reflects statistics from the World Economic Forum, which estimated in 2021 that global gender parity could take over 135 years to reach. The day aims to reignite conversations about gender equity and accelerate change.
Bring Flowers to Someone Day
Bring Flowers to Someone Day celebrates the simple but meaningful act of giving flowers. Whether for celebration, sympathy, or just because, flowers brighten relationships and bring joy. Archaeological discoveries, such as the 1950s excavation by Ralph Solecki in Iraqi Kurdistan, suggest that even Neanderthals may have used flowers in burial rituals, showing how deeply rooted this custom is in human culture.
🌼 Similar ideas are embraced on National Flower Day on March 21 and National Plant a Flower Day on March 12.
Hats for Headway Day
Hats for Headway Day 🇬🇧* (Third Friday in May) was founded in 2024 by Headway, a UK-based charity supporting people affected by brain injuries. On this day, supporters wear quirky or standout hats to raise awareness and funds for rehabilitation, counseling, and research. Held during Action for Brain Injury Week, the event combines a playful activity with a serious purpose—building understanding and resources for those living with brain injuries.
👒 Similar Days: National Hat Day observed every January 15 and Wear A Hat Day in March.
HG Awareness Day
HG Awareness Day was launched in 2012 by the HER Foundation to raise awareness of Hyperemesis Gravidarum (HG), a severe pregnancy condition involving extreme nausea and vomiting. Founders Kimber MacGibbon and Ann Marie King created the nonprofit to support patients, promote early diagnosis, and advocate for research. Their online community began in 2000 and has since become a vital resource for those experiencing HG. This day highlights the condition’s seriousness and the importance of compassionate care.
International Casinos Day
International Casinos Day commemorates the anniversary of the founding of Las Vegas in 1905. It was established in 2025 by Casinos.com, a part of the Gambling.com Group, to honor the history and economic impact of the casino industry. The inaugural day was supported by a proclamation from the Mayor of Las Vegas.
International Conscientious Objectors Day
International Conscientious Objectors Day was started in 1982 by European pacifist groups to honor individuals who refuse military service on moral or religious grounds. It gained formal recognition from the European Bureau for Conscientious Objection in 1985 and later from War Resisters’ International. With support from the Peace Pledge Union in the UK, the day has become a global reminder of the courage it takes to stand by one’s beliefs in the face of pressure to conform.
International Day of Families
International Day of Families was established by the United Nations in 1993 to promote awareness of family-related issues and their role in social, economic, and demographic development. Celebrated annually on May 15, it builds on the 1989 declaration of the International Year of the Family. The day also aligns with broader goals like the U.N.’s 2030 Sustainable Development Agenda, which emphasizes the importance of family-oriented policies in tackling poverty, inequality, and environmental challenges.
💗 There are dozens of national days dedicated to celebrating family, relationships and friends.
International MPS Awareness Day
International MPS Awareness Day, also known as Mucopolysaccharidosis Awareness Day, was founded in 2006 through advocacy by families and the National MPS Society. It raises awareness of mucopolysaccharidosis—a group of rare genetic disorders that affect the body’s ability to break down certain sugars. In 2007, the observance became international, emphasizing the need for early diagnosis, better treatment options, and community support. Educational events and fundraising campaigns aim to improve the lives of individuals living with MPS and support research toward a cure.
International Virtual Assistants Day
International Virtual Assistants Day* (Third Friday in May) is sponsored by the Alliance for Virtual Businesses to recognize the efforts of remote professionals who support clients and businesses around the world. First launched in the early 2000s, the day aligns with the Online Virtual Assistants Convention and raises awareness about the essential services VAs provide. It also promotes respect for flexible work models and highlights opportunities in digital careers.
Kangaroo Care Awareness Day
Kangaroo Care Awareness Day highlights the importance of skin-to-skin contact between newborns and parents, especially for premature infants. The practice, named after the way kangaroos carry their young, was developed in 1979 by Dr. Edgar Rey and Dr. Hector Martinez in Bogotá, Colombia. Their innovative approach improved survival rates in resource-limited hospitals and has since become a key part of neonatal care worldwide.
NASACAR Day
NASACAR Day* (Third Friday in May) was established in 2003 by the NASCAR Foundation to celebrate stock car racing and raise funds for children’s health programs. On this day, fans enjoy special race events, meet-and-greets with drivers, raffles, and charity drives. NASCAR, founded in 1948 by Bill France Sr., has grown into one of the most popular spectator sports in the U.S. The day also promotes the foundation’s efforts like the Speediatrics Children’s Fund and the Betty Jane France Humanitarian Award.
National Bike to Work Day
National Bike to Work Day* (Third Friday in May) promotes biking as a healthy, eco-friendly alternative to driving. Founded in 1955 by the League of American Bicyclists and supported by the American Medical Association, the day is observed during National Bike Month. It highlights the growing number of bicycle commuters and encourages cities to expand cycling infrastructure.
🚲 Related events include World Bicycle Day on June 3 and Bike to School Day in early May.
National Chocolate Chip Day
National Chocolate Chip Day honors the accidental creation of chocolate chips by Ruth Graves Wakefield in 1937 at the Toll House Inn in Massachusetts. Her famous cookie recipe led to an agreement with Nestlé in 1939 and eventually the launch of pre-made chocolate chips in 1941. Chocolate chips revolutionized home baking and today are available in flavors ranging from white and dark chocolate to mint and butterscotch.
🍫 Related days include National Cookie Day on December 4 and World Chocolate Day on July 7.
National Defense Transportation Day
National Defense Transportation Day* (Third Friday in May) was designated by Congress on May 16, 1957 to recognize the importance of transportation infrastructure in national security. In 1962, the entire week became known as National Transportation Week. The observance acknowledges the vast network of air, land, and sea operations that support U.S. military logistics and economic stability. Presidential proclamations are issued annually to reaffirm its importance.
National Endangered Species Day
National Endangered Species Day* (Third Friday in May) raises awareness about the urgent need to protect threatened plants and animals. First signed into law by President Richard Nixon in 1973, the Endangered Species Act is enforced by the U.S. Fish and Wildlife Service and NOAA. This day encourages education, conservation efforts, and support for species preservation, both locally and globally.
National Nylon Stocking Day
National Nylon Stocking Day celebrates the historical and cultural impact of nylon stockings. After DuPont introduced nylon in 1939, stockings became a durable and affordable alternative to silk. During World War II, nylon was diverted for military use, leading to a notorious shortage and even riots. Nylon stockings later gave way to pantyhose and other hosiery styles, but their legacy lives on in fashion history.
National Pizza Party Day* (Third Friday in May) is all about gathering friends and family for one of America’s favorite foods. The day recognizes pizza as a social food—perfect for birthdays, office parties, and casual get-togethers. Though its origins are uncertain, the observance has become a staple of National Pizza Month (October), joining other pizza-related days like National Cheese Pizza Day (September 5) and National Pepperoni Pizza Day (September 20).
National Safety Dose Day
National Safety Dose Day highlights the dangers of opioid misuse and stresses proper storage, disposal, and communication about prescriptions. Communities observe the day by sharing resources and promoting awareness to prevent avoidable medication-related complications.
National Senior Fraud Awareness Day
National Senior Fraud Awareness Day was founded in 2018 by the U.S. Senate and led by Senator Susan Collins. This observance shines a light on scams targeting older adults. With technology constantly evolving, seniors can become vulnerable to phone, email, and in-person fraud. This day encourages education, open conversations, and community vigilance to help protect elderly individuals from emotional and financial harm. It aligns with broader awareness efforts like National Consumer Protection Week.
National Straw Hat Day
National Straw Hat Day is a nod to summer fashion and social history, this day marks the seasonal shift to lighter headwear. First declared an official event in New Orleans in the 1920s by Mayor Andrew McShane, the day was once celebrated with fanfare, sales, and parades. A more somber historical footnote is the 1922 Straw Hat Riot in New York City, which revealed the power of unwritten fashion rules. Today, the day is more cheerful, inviting people to dust off their straw hats and embrace warm-weather style.
👒 Similar Days are National Hat Day observed every January 15 and Wear A Hat Day in March.
Tuberous Sclerosis Complex (TSC) Global Awareness Day
Tuberous Sclerosis Complex (TSC) Global Awareness Day brings attention to TSC, a rare genetic disorder that causes benign tumors in vital organs. The condition, first described in the 19th century, gained wider recognition thanks to the work of Tuberous Sclerosis International. The day promotes inclusion, fights stigma, and supports research into treatments. It also reminds the public that those with TSC deserve full access to education and community life.
VBF Day of Awareness
VBF Day of Awareness / Birthmarks Awareness Day was established by Dr. Linda Rozell Shannon in 1994 and later recognized by U.S. Congress. The day was created to raise awareness of vascular birthmarks and related conditions. May 15 also falls within the Vascular Birthmarks Foundation’s International Month of Awareness. The observance promotes acceptance, encourages early treatment, and supports those affected. Roughly 1 in 10 newborns are born with vascular birthmarks, and the foundation has played a critical role in improving both understanding and medical care.
Peace Officers Memorial Day
Peace Officers Memorial Day was created by Congress in 1961 and officially declared by President John F. Kennedy in 1962, this observance honors law enforcement officers who lost their lives or were injured in the line of duty. In 1994, President Bill Clinton directed flags to be flown at half-staff each May 15. The day falls during National Police Week and serves as a solemn tribute to the over 800,000 officers serving in the U.S., as well as those who made the ultimate sacrifice.
