December 15 National Days

December 15, 2025, is the 350th day of the year, with 15 days remaining. Falling on a Monday in the 50th week, December 15th highlights six observances, including the historical significance of Bill of Rights Day, the global focus of International Tea Day, and the seasonal sweetness of National Cupcake Day.

Below is a list of all 6 national and international days celebrated on December 15, each with a brief explanation.

National & International Days on December 15

Bill of Rights Day marks the ratification of the first ten amendments to the U.S. Constitution in 1791, which protect key civil liberties such as freedom of speech, press, and religion, the right to assemble and petition the government, the right to bear arms, safeguards against unreasonable searches, and the right to due process. The observance was established in 1941 when President Franklin D. Roosevelt proclaimed the date as Bill of Rights Day to emphasize the importance of these freedoms during a time of global conflict.

Cat Herders Day celebrates people who handle jobs or situations that are hard to organize, much like the saying “herding cats.” The day was created in the 1980s by Thomas and Ruth Roy to highlight anyone who manages confusion or complicated tasks with patience. The idea became widely known after a 2000 Super Bowl commercial showed cowboys trying to herd cats as a humorous way to show how challenging such work can be.

🐱 Calling all cat lovers! See also our list of national days for cat owners and celebrate your feline friends in purr-fect style!

International Tea Day is observed on two dates: the UN’s official celebration on May 21 and an earlier version recognized in several tea-producing countries on December 15. The December 15 observance, first held in New Delhi in 2005, was created by trade unions and advocacy groups in countries such as India, Sri Lanka, Nepal, and Kenya. Its purpose is to highlight how the tea industry affects workers and small growers by calling attention to fair wages, safe working conditions, and sustainable farming practices.

National Cupcake Day celebrates the small cakes that have been part of American baking since the 1700s. The day highlights how cupcakes evolved from simple cup-measured recipes to modern treats with countless flavors and designs. It encourages people to bake their own, enjoy a favorite variety, or learn more about the history behind this long-loved dessert.

National Cupcake Day

National Lemon Cupcake Day celebrates lemon-flavored cupcakes, known for their tangy, citrus taste. Celebrated on the same day as National Cupcake Day, it offers a chance to spotlight this refreshing twist on a classic dessert.

National Wear Your Pearls Day is a depression and anxiety awareness observance founded in 2015 by author DeAnna Bookert. The day uses the pearl as a symbol for how strength can develop over time, since a pearl forms when an oyster protects itself by gradually coating an irritating grain of sand. The observance encourages people to remember that, in a similar way, they can keep growing and creating meaning even when life brings challenges.