Proper noun
Festivus
A nondenominational holiday featured in a Seinfeld episode, now celebrated (seriously or otherwise) on December 23rd.
Frank Costanza was a classic sitcom eccentric whose many dubious accomplishments included marketing a brassiere for men and creating Festivus, a winter holiday “for the rest of us,” celebrated with tests of strength and other bizarre rituals. Source: Internet
Rustico Alexandria presents its 10th annual Festivus Celebration, a beer and food event highlighting the best of the season. Source: Internet
The Festivus Edition of the OTB Caption Contest is over. Source: Internet