This is a supertrope to the following tropes:
- April Fools' Plot: Celebrated worldwide on April 1st. Expect plots with Comedy Tropes, usually good nature pranks but may be an opportunity to get revenge on the Jerkass.
- Christmas Episode: Celebrated worldwide on December 25th. Expect the use of Christmas Tropes.
- Festival Episode: Observed in Japan on various dates.
- Founding Day: A celebration of when a country or organization was founded. Includes Independence Day, celebrated in the United States on July 4th.
- Halloween Episode: Celebrated October 31st. Expect plots dealing with finding a costume and going trick-or-treating.
- New Year Has Come: Celebration of the beginning of a New Year.
- Thanksgiving Day: An American celebration in November, emphasizing food, thankfulness, and often American football. Closely resembling harvest festivals found in other cultures.
- Valentine's Day Episodes: Celebrated on February 14th worldwide. Japan & South Korea have a similar holiday, White Day, celebrated on March 14th. Expect plots with Love Tropes.
Examples should only be listed if they do not fall under one of the subtropes listed above.
- The Keymon Ache episode "Holi War" has the characters celebrate the Indian festival of Holi by fighting each other with Water Guns and Balloons filled with colored water.
- Several Motu Patlu episodes have the characters celebrate the festivals of Holi and Diwali.
- There is an episode of Pleasant Goat and Big Big Wolf where the characters celebrate the Mid-Autumn Festival.
- The Golden Girls episode "Mother's Day" deals with the girls reminiscing about past Mother's Days while waiting for their own children to call them.
- Married... with Children had two episodes devoted to Labor Day:
- "Hot Off the Grill" has Al holding a Labor Day barbecue, where Kelly inadvertently uses the ashes of Marcy's dead aunt to cook the burgers.
- "We'll Follow the Sun" has the Bundys taking a trip for Labor Day and getting stuck in horrible traffic.
- The Eerie, Indiana episode "The Lost Hour" focuses on Daylight Savings when Marshall sets his watch forward an hour despite town rules.
- M*A*S*H has an episode where the personnel stationed at the 4077th Mobile Army Surgical Hospital celebrate Boxing Day by swapping roles.
- Flodder: The TV series had several, including Christmas, Sinterklaas, April Fools, and New Year's Eve.
- Rugrats is a rare example of a show with episodes for Jewish Holidays, including one for Passover and one for Hanuka.
- American Dragon: Jake Long has one for the Lunar New Year - slightly different from Jan 1. Talks about Chinese traditions on the day as well.
- In the Sponge Bob Squarepants episode "Opposite Day", Squidward makes up the holiday Opposite Day to convince SpongeBob and Patrick to act normal, but it ultimately backfires.
- Let's Go Luna! episode "Spring Has Not Sprung" follows the kids as they learn about the Indian festival of Holi while searching for some monkeys who have taken Andy's camera.
- Regular Show has a Daylight Savings episode called "Saving Time", where Mordecai and Rigby prank the other park attendants by setting all the clocks in the house to the wrong time. They inadvertently cause the park to leave its place on the ground and float to the time zone fitting its incorrect time because of this.
- Teen Titans Go! has a Daylight Savings episode where the Titans have to save the skipped-over hour from a farmer. Don't ask, we have no idea either.
- The Ready Jet Go! episode "Bortron Leprechaun" takes place on St. Patrick's Day.
- PJ Masks: has Christmas ("Gekko Saves Christmas"), Halloween ("Halloween Tricksters") and Easter ("Easter Wolfies").
- Phineas and Ferb had several Halloween-episodes, two Christmas episodes, and a New Years Eve episode.