It’s a Festivus for the rest of us!” Frank Costanza declares. Here's what to know about the secular holiday. What is the meaning of Dec. 23 on 'Seinfeld'? As a card sent to

Festivus begins with the airing of grievances, where you gather your family around the table and tell them all the ways they’ve disappointed you

Festivus is a wacky holiday popularized in a 1997 “Seinfeld” episode. Billed as “Festivus for the rest of us,” the holiday is celebrated by the Costanza clan on Dec. 23 as an all-inclusive, secular alternative to Christmas consumerism.