You must not be a fan of Seinfeld. Festivus is a holiday made up by one of the main character's (George Castanza) father (Frank Castanza). In the episode, George tells his boss about his father's made up holiday and the boss doesn't believe him, so George invites him over for the celebration. The whole holiday is explained in the episode. Also the little coupon that KTO posted was on another episode of Seinfeld, where George was sick of people giving donations out in his name as a Christmas gift....so George made up a fund called "The Human Fund" and it ends up backfiring on him........