Like most sitcoms, That '70s Show produced many Christmas specials that premiered during the winter. However, the Fox television show's best holiday episode technically wasn't set in December and definitely wasn't meant to be a Christmas special. Instead, the episode was inspired by a popular holiday movie often played in the winter months, and it premiered in September. The sitcom wasn't the first series to parody this film, but it still put its own spin on the classic, and it turned out to be one of the show's most interesting Christmas episodes (that wasn't meant to be a Christmas episode).
https://screenrant.com/that-70s-show-interesting-christmas-episode-not-during-holiday/