May 16 is the 136th day of the year (137th in leap years) in the Gregorian calendar, leaving 229 days until the end of the year. Today’s observances span art, food, science, equality, and even novelty pets, offering something meaningful—or just fun—for nearly everyone.

Several observances on May 16 shift each year based on the weekday, such as National Bike to Work Day and National Pizza Party Day, while the rest are fixed on the date.
Below is a full overview of the 25 national and international days observed on May 16.
National and International Days on May 16
Drawing Day: Encourages people of all ages to pick up a pencil and get creative. First observed in 2008 as a grassroots movement to celebrate drawing and artistic expression, this day highlights the value of art in everyday life. It also brings attention to the countless illustrators and designers behind everything from children’s books to greeting cards.
✍️ Similar in spirit to National Coloring Book Day on August 2.
Hats for Headway Day 🇬🇧* (Third Friday in May): 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.
Honor Our LGBT Elders Day: Recognizes the contributions and sacrifices of LGBT seniors who paved the way for today’s equal rights movements. Founded in 2015 by Nate Sweeney, this observance is supported by SAGE, the oldest and largest advocacy group for LGBT elders in the U.S. The day is a time to honor personal stories, increase awareness, and promote support services for aging LGBT individuals.
🌈 Related days include National Coming Out Day on October 11 and International Day Against Homophobia, Transphobia and Biphobia on May 17.
International Boys Day : Highlights the importance of supporting boys in their development toward becoming responsible, respectful men. Founded in 2018 by Dr. Jerome Teelucksingh—who also created International Men’s Day (November 19)—this observance emphasizes family bonding, emotional wellbeing, and societal support for boys. It also serves as a complement to International Day of the Girl Child (October 11), underlining the importance of uplifting all children.
International Day of Light: Officially launched by UNESCO in 2018 to mark the anniversary of the first successful laser operation by physicist Theodore Maiman in 1960. This global observance highlights the essential role of light in science, culture, communication, energy, and education. It builds on the success of the 2015 International Year of Light and celebrates light-based technologies that drive progress and sustainability worldwide.
International Day of Living Together in Peace: Proclaimed by the United Nations General Assembly in 2017 to encourage reconciliation, tolerance, and understanding across cultures and communities. Observed annually on May 16, the day calls for individuals and nations to set aside differences and build peaceful societies through dialogue and cooperation. It connects to earlier initiatives like the International Year for a Culture of Peace (2000) and the Decade for a Culture of Peace and Non-Violence for the Children of the World (2001–2010).
International Invention Day: Initiated by the company Vention and first celebrated in 2024. Its goal is to honor inventors, both past and present, who have shaped our world through innovation and creativity. The day also aims to inspire future inventors by celebrating the power of ideas.
💡 Related observances include National Inventors Day on February 11, National Kid Inventors Day on January 17, and National Inventors Month in August.
International Virtual Assistants Day* (Third Friday in May): 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.
NASACAR Day* (Third Friday in May): 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 Barbecue Day: Celebrates one of America’s most cherished cooking traditions. While its roots trace back to indigenous Caribbean practices and Spanish explorers who named the technique “barbacoa,” barbecue became a culinary staple in the American South. The use of pork, especially in North Carolina, helped shape regional barbecue styles. Today, this day invites people to fire up their grills and enjoy the smoky flavors that have become a hallmark of U.S. cuisine.
National Biographer’s Day: Honors the first meeting between English writer Samuel Johnson and his biographer James Boswell on May 16, 1763. Their legendary collaboration later led to Boswell’s The Life of Johnson, one of the most celebrated biographies in English literature. This day serves as a tribute to the art of biography writing and encourages readers to explore stories that preserve the lives and legacies of others.
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 Classic Movie Day: Invites movie lovers to revisit iconic films that have stood the test of time. Observed each May 16, this day encourages people to appreciate cinema history by watching classics and discussing their cultural impact. It’s an opportunity to reflect on how storytelling, music, and visual innovation helped shape generations of filmgoers.
🎥 Related days include National Film Score Day on April 3 and Global Movie Day celebrated on the second Saturday in February.
National Coquilles Saint Jacques Day: Highlights the classic French scallop dish known for its creamy wine sauce, mushrooms, breadcrumbs, and cheese. Often served in scallop shells, this recipe is named after Saint James, whose symbol is the scallop shell—commonly seen along the Camino de Santiago pilgrimage.
National Defense Transportation Day* (Third Friday in May): 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 Do Something Good for Your Neighbor Day: Encourages kindness and community support. Founded in 2009 by Starr Valentino, the day has received over 500 proclamations across North America. It reminds us to follow the Golden Rule and strengthen local connections through simple acts of goodwill.
☀️ The observance aligns with broader themes of kindness celebrated on Random Acts of Kindness Day on February 17 and Global Pay It Forward Day on April 28.
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 Love a Tree Day: Reminds us of the value trees bring to our lives, from providing shade and oxygen to supporting ecosystems and offering beauty. Although the origins of this day are unclear, it complements Arbor Day (last Friday in April) and Earth Day (April 22) by encouraging tree planting and environmental awareness. The U.S. Forest Service reports around 766 million acres of forest land in the country today.
National Mimosa Day: Celebrates the refreshing brunch cocktail made with orange juice and champagne. The day was created by holiday enthusiast Jace Shoemaker Galloway and is named after the yellow mimosa flower, which the drink resembles in color. While its exact origin is debated, the mimosa became popular in the U.S. during the 1960s. It is closely related to the Buck’s Fizz cocktail, created in London in 1921.
🍸 Related celebrations include National Cocktail Day on March 24. For more alcohol-themed days, visit the dedicated article.
National Piercing Day: Brings attention to the practice of body piercing, which dates back to ancient civilizations. While ear piercing was once the most common, today piercings are widely accepted across many parts of the body. The day encourages people to celebrate self-expression through piercings and to learn about the cultural and historical roots of this enduring form of adornment.
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 Sea Monkey Day: Honors the whimsical brine shrimp kits that became a pop culture hit in the 1960s. Invented by Harold von Braunhut in 1957 and marketed through comic books, Sea Monkeys offered children a glimpse into the world of aquatic life. These novelty pets even went to space with astronaut John Glenn in 1998. Today, they continue to be a fun symbol of retro science curiosity.
Nickel Day: Gives overdue recognition to a small but essential metal used in everything from batteries to coins. Though the origins of the day remain unclear, May 16 has become a time to learn about nickel’s properties, uses, and contributions to modern technology. The element’s symbol is Ni and it holds atomic number 28 on the periodic table.
🧪 Related observances include National Periodic Table Day on February 7 and National Chemistry Week in October.
Tarlov Cyst Disease Awareness Day: Established in 2023 by advocate Katie Maskey to raise awareness of this rare and often misunderstood condition affecting spinal nerve roots. Named after neurosurgeon Isadore Tarlov, who first described the cysts in the 1930s, the disease can lead to serious neurological symptoms and is often underdiagnosed. The day is now officially recognized in more than 20 U.S. states and five Canadian provinces.
Wear Purple for Peace Day: Originated in the 1970s with the whimsical idea that extraterrestrial life might respond to peaceful human behavior. Though its beginnings were unusual, the day has evolved into a broader call for unity and harmony. Wearing purple has come to symbolize peace, compassion, and global solidarity, making this observance a lighthearted yet meaningful celebration of coexistence.
➡️ Have you already seen DigitalHyyge’s National Days Calendars 2025?
➡️ Complete list of May National Days
➡️ Complete list of June National Days
➡️ Curious to see more national and international celebrations? We have dozens of national days lists curated for you!