Festivus (/ˈfɛstɪvəs/) is a secular holiday celebrated on December 23 as an alternative to the pressures and commercialism of the Christmas season. Originally created by author Daniel O’Keefe, Festivus entered popular culture after it was made the focus of the 1997 Seinfeld episode “The Strike“, which O’Keefe’s son, Dan O’Keefe, co-wrote.