An
Epic Marathon of Every Simpsons Ever is being aired on cable TV's
FXX channel (which is buried in the sports channels section by Comcast). It's all seasons from the beginning, running all day and all night, 12 days of 552 episodes. They are currently on Season 14 from 2003.
Tonight at 10:30 pm: Treehouse of Horrors XIV (2003). Note that in the aftermath of the September 11, 2001 terrorist attacks, the
Treehouse of Horrors XII (2001) omitted all of the crazy credits with morbid names. They used all of the real names of the cast and crew.