If your resident office nerd happens to be away from work today, it’s probably because he’s home worshipping at the altar of Chewbacca. Today is “May the Fourth" as in “May the Fourth Be With You,” the most sacred holiday for Star Wars obsessives world over.

The fan-created celebration — which for you Star Wars neophytes is a pun on the iconic Jedi catchphrase — has its origins in Canada, when in 2011, a group of George Lucas stans organized a Star Wars tribute at the Toronto Underground Cinema. The pun itself was first used in 1979, when Britain’s Conservative Party took out a print add on May 4, congratulating Margaret Thatcher on becoming Prime Minister.

In the years since, fans have marked the annual occasion with marathon screenings and theme parties. Even Disney has hopped on board, coopting the holiday as a way to sell its endless array of Stars Wars merchandise. Disney stores around the world have a variety of events planned, including something called a “droid-drawing tutorial.”

But corporate posturing aside, today really belongs to Carrie Fisher, who left legions of fans brokenhearted when she passed away earlier this year. The star — who once revealed that she was asked to lose 35 lbs. in preparation for Star Wars: The Force Awakens — cheekily acknowledged the holiday in an interview with Stephen Colbert.

“They want to hire about three-fourths [of me] and so I have to get rid of the fourth,” she told Colbert. “The fourth can’t be with me.”

Fisher’s daughter, Billie Lourd, paid tribute to her late mother on Instagram. And she wasn’t the only one who took to social media to celebrate what has become unofficially known as #StarWarsDay.

💫👩‍👧💫 #maythe4thbewithyou

A post shared by Billie Lourd (@praisethelourd) on

Star Wars: The Last Jedi director Rian Johnson enlisted a very spcial guest to help him celebrate.

Ellen DeGeneres seemed to have gotten her long-running space sagas confused.

While Lin-Manuel Miranda spent some quality time with the late Han Solo.

Luita Nyong’o gave an epic shout out to all the Star Wars cosplayers out there.

Awww! May the 4th be with you too! #mazkanata #Repost @growinguponmainstreet

A post shared by Lupita Nyong'o (@lupitanyongo) on

Samuel L. Jackson channeled his fallen Jedi Mace Windu.

Reminiscing with my battle light saber. Lots of scars on that green light rod. MAY THE FOURTH BE WITH YOU!!!!

A post shared by Samuel L Jackson (@samuelljackson) on

And Rogue One’s Riz Ahmed found himself on planet Wookie.

However you decide to celebrate #StarWarsDay, just do us a favor: don’t drink and fly.