If you’re tired of tinsel and holiday cheer, today is your day. It’s Festivus, the non-commercial holiday that “Seinfeld” fans have celebrated every December 23rd since it appeared in an episode in 1997. The holiday includes a Festivus dinner, The Airing of Grievances, Feats of Strength, and an aluminum pole in place of a Christmas tree. If you didn’t see the episode, here’s a clip