August 29, 2026, is the 241st day of the year, with 124 days remaining, and it falls on a Saturday — in the thirty-fifth week of the year, with the moon now waning past last night’s eclipse.
With 14 national and international days on the calendar, August 29 keeps a similar pace to the days around it. International Cosplay Day brings the world’s costume community together, a tradition that traces back to 1930s conventions and took its modern name in Japan in 1984. National Chop Suey Day traces its roots to tsap seui, a dish from Taishan, Guangdong, later adapted into a Chinese-American classic. International Day Against Nuclear Tests marks the 1991 closure of the Soviet Semipalatinsk test site and the ongoing push for a nuclear-weapon-free world. And Play Music on the Porch Day turns front porches into concert stages across more than 70 countries.
National Days on August 29
All national & international days celebrated today
14 celebrations on this day Day 241 of 365 · 124 days left · week 35 · Virgo season · 🌖 waning gibbousInternational Cosplay Day
Launched in 2010 by Jennifer Alice, the day unites the global costume-play community — a practice tracing back to 1930s conventions, named in Japan in 1984.
National Chop Suey Day
Traces back to tsap seui, a dish from Taishan, Guangdong, adapted by Chinese immigrants into an icon of Chinese-American cuisine.
International Day Against Nuclear Tests
Proclaimed by the UN in 2009, marking the 1991 closure of the Soviet Semipalatinsk test site and the push toward a nuclear-weapon-free world.
Play Music on the Porch Day
A worldwide music event founded by Brian Mallman, uniting musicians across more than 70 countries and 1,000 cities for an afternoon of porch performances.
Here’s every observance celebrated on August 29, 2026.
National & International Days on August 29
Here’s the story behind every celebration on August 29, from nuclear disarmament to a porch guitar session.
According to Hoyle Day
According to Hoyle Day pays tribute to Edmond Hoyle (1672–1769), the Englishman who became the first major authority on card games. He began teaching the popular game of Whist to London’s elite at age 69 and later published books that set standard rules not only for Whist but also for Chess, Backgammon, and other games. Hoyle’s works gave rise to the phrase “according to Hoyle,” meaning to play by the rules. His death on August 29, 1769, makes this a fitting date of remembrance.
Individual Rights Day
Individual Rights Day commemorates the birthday of philosopher John Locke (1632–1704), whose writings on natural rights—life, liberty, and property—influenced the Enlightenment, the American Revolution, and the U.S. Constitution. The observance was founded by Dr. Tom Stevens of the Objectivist Party to honor Locke’s ideas and remind people that governments should safeguard individual rights rather than infringe on them.
International Bat Night
International Bat Night* (Last full weekend in August) began in 1997 under the Eurobats Agreement to encourage bat conservation. Events across more than 30 countries promote public understanding of bats, dispelling myths and highlighting their ecological importance. Bats play vital roles as pollinators, seed dispersers, and insect controllers, making their protection critical for biodiversity.
International Cosplay Day
International Cosplay Day* (Last weekend in August) celebrates the global community of fans who bring fictional characters to life through costume play. While fans dressed as characters at conventions as early as the 1930s, the Japanese term “cosplay” was coined in 1984 by Nobuyuki Takahashi after visiting WorldCon. The practice spread rapidly with anime and manga’s rise, and in 2010 Jennifer Alice launched International Cosplay Day to unite fans worldwide. The art form now bridges cultures through events such as the World Cosplay Summit.
International Day Against Nuclear Tests
International Day Against Nuclear Tests was proclaimed by the United Nations in 2009 and first observed in 2010. The date marks the closure of the Soviet Semipalatinsk nuclear test site in Kazakhstan on August 29, 1991. It also recalls the first Soviet nuclear test at the site in 1949. The day raises awareness of the devastating human and environmental impact of nuclear testing and supports the goal of a nuclear-weapon-free world.
More Herbs, Less Salt Day
More Herbs, Less Salt Day encourages people to season food with herbs and spices instead of relying on salt. First mentioned in the 1990s, the day highlights the health risks of high sodium intake, such as high blood pressure and heart disease, while showcasing the flavor and health benefits of herbs, including antioxidants and anti-inflammatory properties.
National Chop Suey Day
National Chop Suey Day celebrates one of the most iconic dishes of Chinese-American cuisine. While often thought to be an American invention, the dish has roots in Taishan, Guangdong, where a similar dish called tsap seui (“miscellaneous leftovers”) was common. Chop suey—meat, eggs, and vegetables in a starch-thickened sauce served with rice or noodles—gained popularity in the U.S. in the late 19th century as Chinese immigrants adapted recipes to local tastes.
National Lemon Juice Day
National Lemon Juice Day recognizes the many uses of lemon juice, from flavoring food and drinks to household cleaning and natural remedies. Though the exact origins of the observance are unclear, it pairs well with peak lemon season and serves as a reminder of the fruit’s versatility.
🍋 Related observance, National Lemon Day is celebrated on July 23.
National Sarcoidosis Awareness Day
National Sarcoidosis Awareness Day falls on August 29 each year. It was designated by federal law, Public Law 102-94, which named August 29, 1991 as National Sarcoidosis Awareness Day. The date was chosen because it was the birthday of Carolyn Anderson, a receptionist for Representative James Slattery who had sarcoidosis and championed the original resolution. The day raises awareness of sarcoidosis, an inflammatory disease that most often affects the lungs but can also involve the skin, eyes, muscles, and other organs.
🫁 April is widely recognized as Sarcoidosis Awareness Month, and April 13 is marked globally as World Sarcoidosis Day.
National Sport Sampling Day
National Sport Sampling Day* (observed on the 241st day of the year) was created in 2022 by Steve and Kerry Boyle, co-founders of 2-4-1 Play, alongside National Day Calendar. Inspired by their motto “Life’s 2 Short 4 Just 1 Sport,” the day encourages children to try multiple sports rather than specialize early, aligning with youth development models that promote physical literacy, skill variety, and long-term enjoyment of physical activity.
National Swiss Winegrowers Day
National Swiss Winegrowers Day 🇨🇭 honoring the country’s winegrowers and their vineyards. Switzerland’s wine regions, including Valais, Vaud, German-speaking Switzerland, Geneva, Ticino, and the Three-Lakes region, are home to more than 2,500 winegrowers cultivating over 14,000 hectares of vineyards. The day gives a nod to this craft, distinct from Switzerland’s larger organized wine events like the harvest festivals held later in the fall.
Play Music on the Porch Day
Play Music on the Porch Day* (Last Saturday in August) is a worldwide music event in which musicians in over 70 countries and more than 1,000 cities take part. The event started with founder Brian Mallman and has grown since 2018, when thousands of musicians across at least 70 countries participated, with the movement continuing to expand each year. On this day, people are invited to play or listen to music on porches and in neighborhoods, celebrating music as something that connects people everywhere.
Potteries Bottle Oven Day
Potteries Bottle Oven Day 🇬🇧 is observed every August 29 in Stoke-on-Trent, England, commemorating the last coal firing of a traditional bottle oven on that date in 1978. The event, organized by Gladstone Pottery Museum, marked the end of an era for these iconic brick kilns that once dominated the local skyline, with around 2,000 standing at their peak in the 1930s. Today the day is celebrated with talks, museum exhibits, and guided walks around the surviving bottle ovens in the region.
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National Days in August
