Festivus is a secular holiday celebrated on December 23 as a way to commemorate the holiday season without participating in its pressures and commercialism. Festivus became part of worldwide popular culture after being featured on an episode of the American TV show Seinfeld in 1997.
Festivus was conceived by writer Dan O'Keefe and was celebrated by his family as early as 1966. The holiday was later introduced into popular culture by O'Keefe's screenwriter son Daniel on an episode of Seinfeld. The holiday's celebration, as it was shown on Seinfeld, included an unadorned aluminum "Festivus pole", practices such as the "Airing of Grievances" and "Feats of Strength", and the labeling of easily explainable events as "Festivus miracles".
(... from Wikipedia on 2012-04-17 22:27:49)