Couples Only Movie Night is an event held at the Drive-in theater in the Land of Ooo. The couples only stipulation sets the premise of the episode "Go With Me," in that Finn can only attend if he brings someone he can smooch.
The event apparently features romantic films in accordance with the couples only theme, as seen when Finn and Marceline decide to attend as friends. In accordance with the theme, the movie shown in the episode is Love Kaboom.