Merry XMas!

Actually it was a holiday some guy made up in 1966 and the writers heard about.

Festivus
From Wikipedia, the free encyclopedia.

Frank Costanza (played by Jerry Stiller) shows the aluminum pole his family has used in past Festivus celebrations to Jerry Seinfeld (played by himself)Festivus is a nondenominational holiday popularized by Seinfeld, a popular American television sitcom of the 1990s. It was featured on episode number 166 of the show, entitled The Strike, which first aired on 18 December 1997. Many fans of Seinfeld now celebrate the holiday in real life.

Festivus is celebrated each year on December 23. Its slogan is "A Festivus for the rest of us!"

The character Frank Costanza (played by Jerry Stiller) created it as an alternative holiday in response to the commercialization of Christmas. He explained its origins during the episode to the character Cosmo Kramer (played by Michael Richards), as seen in the following dialogue:

Frank Costanza: Many Christmases ago, I went to buy a doll for my son. I reached for the last one they had, but so did another man. As I rained blows upon him, I realized there had to be another way.
Cosmo Kramer: What happened to the doll?
Frank Costanza: It was destroyed. But out of that a new holiday was born . . . a Festivus for the rest of us!
Cosmo Kramer: That must've been some doll.
Frank Costanza: She was!
In the episode, Kramer had become interested in resurrecting the holiday after hearing the plight of his friend—Frank Costanza's son—George, who used the holiday celebration he hated in his youth as a defensive excuse to his employer, Kruger (played by Daniel Von Bargen). George had been confronted by Kruger after handing out cards for Christmas to his fellow employees stating a donation had been made to a fake charity called The Human Fund ("Money For People") in lieu of exchanging Christmas presents. George defended himself saying that he feared persecution for his beliefs, for not celebrating Christmas. Calling his bluff, Kruger came home with George to see Festivus in action.

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Main elements of Festivus

The Airing of GrievancesThe Festivus celebration includes three major components:

The Festivus Pole: During Festivus, an unadorned aluminum pole is displayed, apparently in opposition to the commercialization of decorated Christmas trees, and because the holiday's creator, Frank Costanza, "find tinsel distracting." Local customs have changed and you may be able to decorate your pole with non-threatening plain decorations.
The Airing of Grievances: At the Festivus dinner, a participant tells friends and family all of the instances where they disappointed him or her that year.
The Feats of Strength: The head of the family tests his or her strength against one participant of the head's choosing. Festivus is not considered over until the head of the family has been pinned. A participant is allowed to decline to attempt to pin the head of the family only if they have something better to do instead.
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Origin
The Festivus idea came to the show through writer Daniel O'Keefe. His father, Dan O'Keefe, had invented a Festivus holiday in 1966, including many of the features later included in Seinfeld. He was inspired in part by the Samuel Beckett play Krapp's Last Tape, whose protagonist tapes himself speaking at different times in his life; the original Airing of Grievances was spoken into a tape recorder, and the O'Keefe family retains some of the tapes. (The father's career as a Reader's Digest editor meant internal politics of that organization are prominently featured; external grievances were permitted.) The O'Keefe tradition did not have a set date, but would take place in response to family tension, "any time from December to May" (Salkin). The phrase "a Festivus for the rest of us" also derived from an O'Keefe family event, the death of the elder O'Keefe's mother. The holiday made it onto Seinfeld after the writing team was amused by O'Keefe's retelling.

The holiday was also mentioned in O'Keefe's 1982 book on cults and the paranormal, Stolen Lightning ISBN 0826400590.