Festivus, a holiday popularized by the tv show 'Seinfeld', is being celebrated, with some sources indicating it falls on December 23. The holiday, often referred to as a celebration for 'the rest of us', has unclear origins, with some outlets exploring its real origins and others focusing on its 'Seinfeld' roots. Various guides are available on how to celebrate Festivus, including a simplified 5-step process and information on watching the related 'Seinfeld' episode.