Although December 23 appears to be the generally accepted date for Festivus, many readers will be traveling and otherwise occupied next weekend, so I'd like to take this opportunity to wish you all readers Happy Festivus (the link is to the relevant clips from the Seinfeld episode where the holiday was introduced to the world). May you all have a healthy airing of grievances.
For those who have not yet ordered your aluminum Festivus pole, information is available here on where you can get one.
Also, Wikipedia has an excellent entry on Festivus and the story behind the Seinfeld episode. Wikipedia sets the unofficial date for Festivus as December 23.