Festivus, “Seinfeld”

Festivus was introduced by Jerry Stiller’s Frank Costanza during one Seinfeld Episode from 1997. It takes place on December 23rd every year.

The holiday, also known as “a Festivus for the rest of us,” was created for those looking for a Christmas alternative to escape the pressures and commercialization of the season.

Ways to celebrate include voicing grievances, heroic acts, and recognizing easily explainable events as Festivus Miracles.

Complaints are voiced immediately after dinner, with everyone at the table talking about how disappointed they have been over the past year.

Feats of Strength takes place after dinner, where the head of the household challenges one person to a wrestling match.

Oh, and don’t forget to swap your decorated Christmas tree for a plain aluminum pole!

Galentine’s Day, Parks and Recreation

Galentine’s Day was first introduced by Amy Poehler’s Leslie Knope during an event Parks and Recreation Episode in 2010. It takes place on February 13th every year.

The purpose of the holiday is to recognize and honor relationships with girlfriends before Valentine’s Day.

Ways to celebrate include a boozy waffle brunch and exchanging gifts with just friends.

As Leslie put it, “Every February 13th, my girlfriends and I leave our husbands and boyfriends at home and we just come over and celebrate breakfast style. Ladies celebrate ladies. It’s like Lilith Fair, without the fear.” Plus frittatas.”

Chrismukkah, “The OC”

Chrismukkah was first introduced by Adam Brody’s Seth Cohen The OK in 2003. There is no exact date for this holiday, but it lasts nine nights.

The hybrid name is a combination of Christmas and Hanukkah. Chrismukkah was created to enjoy the best of both holidays.

Ways to celebrate include “eight days of presents, followed by a day of presents,” as Seth describes on the show.

Merlinpeen, “30 Rock”

Merlinpeen was first introduced by Judah Friedlander’s Frank Rossitano 30 Rock in 2009. There is no official date for this holiday, but it occurs around Christmas time.

It was created to coincide with the Pranksmen’s false religion called Verdukianism and to opt out of Kenneth Parcell’s (Jack McBrayer) Secret Santa.

One way to celebrate is to leave work on Merlinpeen early.

The Verducian belief includes “the healing power of root beer” and “that a man can have up to nine wives if two of them are male,” according to the characters in the series.

Another holiday celebrated within the fictional religion is the Verdukian Holiday of Mouth Delights, which includes enjoying free sausage pizza.

Face Slapping, “How I Met Your Mother”

Slapsgiving was first introduced as the title of a How I met your mother episode in 2007. Fans might choose to forego this celebration, but it occurs every Thanksgiving.

It came about when Neil Patrick Harris’s Barney Stinson lost the slap bet and Jason Segel’s Marshall Eriksen gave five slaps that he could give to Barney at any time. Even if it’s not a fun holiday for the slap recipient, the comedic episode is certainly entertaining to watch.

Ways to celebrate include choosing a slapper from the Noble Slap Master, creating a slap countdown to the big event, and cutting out hand-shaped paper turkeys. There is also an official song.

It’s a day full of slap-atizers and pumpkin pie!

Leap Day, “30 Rock”

Leap Day became a significant (fictional) holiday when it was first introduced by Alec Baldwin’s Jack Donaghy’s On 30 Rock in 2012. It takes place every four years on February 29th.

The holiday stems from Jack’s dream sequence after he eats rhubarb leaves and is visited by a creature with gills named Leap Day William, who emerges from the Mariana Trench to trade children’s tears for candy.

Ways to celebrate include eating rhubarb slices, trying new things, wearing blue and yellow, and living by the motto that nothing matters on Leap Day because “real life is for March!”

Treat Yo’ Self Day, Parks and Recreation

Treat Yo’ Self Day was first introduced by Tom Haverford by Aziz Ansari Parks and Recreation in 2011. It takes place once a year on October 13th.

Considered the “best day of the year,” Tom and Retta’s Donna Meagle spends the entire day treating herself to foods, activities, and purchases that make her happy.

Ways to celebrate include indulging in clothes, scents, massages, mimosas and fine leather goods, and eating sushi that was once owned by celebrities – just like the two do on the show.

Ludachristmas, “30 Rock”

Ludachristmas was first introduced by the cast and writers in an episode of the same name 30 Rock in 2007. There is no official date on which this holiday occurs, but it occurs around Christmas time.

Yearly, The Girlie Show Employees host a highly anticipated company party before the holidays. The party is legendary for its drunken revelry and throwing away of company Christmas presents.

Ways to celebrate include hiring a stripper, throwing out useless gadgets (like photo scanners and paper shredders), and indulging in an alcohol-soaked bubble before returning for the holidays. It’s time to safely release office-related frustrations in a Christmas sweater.

Best Friends Day, “SpongeBob SquarePants”

Best Friends Day was first introduced as a fictional holiday in an episode of SpongeBob SquarePants in 2007. It takes place on February 19th every year.

The day was created to recognize and celebrate the relationship formed between friends. In the series, Patrick Star celebrates his friendship with SpongeBob by giving bubble gum.

Ways to celebrate include giving your friends gifts that you think they will appreciate, rather than something you enjoy yourself. (Patrick didn’t do this right the first time and gave SpongeBob a giant bubblegum ball, which he thought was disgusting.)