December 7 National Days

December 7, 2025, is the 342nd day of the year, with 23 days remaining. Falling on a Sunday in the 49th week, December 7th features six national and international observances shaped by three main themes: aviation, handwritten communication, and remembrance. The date also includes solemn reflection through Pearl Harbor Remembrance Day, alongside lighter celebrations that encourage creativity, imagination, and generosity.

Below is a list of all national and international days celebrated on December 7, each with a brief explanation.

National & International Days on December 7

International Civil Aviation Day highlights how modern air travel became possible and why it matters today. It marks the 1944 agreement that created the basic rules for flying between countries and led to the formation of the International Civil Aviation Organization (ICAO). The day helps people understand that civil aviation also supports global trade, enables emergency and humanitarian flights, and connects communities that would otherwise be isolated.

National Cotton Candy Day celebrates the machine-spun confection created in 1897 by dentist William Morrison and confectioner John C. Wharton. First introduced widely at the 1904 St. Louis World’s Fair, it soon became a popular treat at fairs, festivals, and amusement parks.

National Cotton Candy Day

National Illinois Day highlights the state’s development since it became the 21st state in 1818. Illinois grew quickly because of its central location and access to major waterways and rail lines, which supported farming, manufacturing, and trade. It is widely known as the “Land of Lincoln” because Abraham Lincoln lived there for many years and began his political career in the state, shaping both Illinois and the nation.

National Letter Writing Day encourages people to reconnect through handwritten correspondence at a time when most communication happens on screens. Founded in 2014 by author Richard Simpkin, the observance highlights the personal connection that a physical letter can offer, and it also honors Mark Twain, who frequently expressed himself through detailed letters.

📝 A related observance, National Handwriting Day, takes place each year on January 23.

National Pearl Harbor Remembrance Day honors the Americans who were killed or wounded during the attack on Pearl Harbor on December 7, 1941. More than 3,500 service members and civilians were affected that morning, an event that led the United States to enter World War II. Established by Congress in 1994, the observance encourages reflection on the lives lost and the lasting impact the attack had on the nation and its history.

National Slime Day, founded in 2022 by Ace Slime LLC, celebrates slime as a fun sensory material and an easy way to learn basic chemistry. It also highlights the huge online community that enjoys its colors, textures, and ASMR-style sounds.