Festivus Was Not Created by the Show
Contrary to popular belief, George’s dad did not create Festivus. The fake holiday was created in 1966 by an editor of Reader’s Digest named Dan O’Keefe. He created it to celebrate the anniversary of his first date with his wife. O’Keefe’s son was actually a writer on “Seinfeld” and he added it to the script, and that is how it became a Seinfeld thing.