All of the resorts have events like pumpkin carving, movies, perhaps trick or treating and characters which I think are pretty popular but we've never been. None of the parks do anything other than the party at MK.
We were at Yacht Club last Halloween and attended the Halloween party MK but I located a flyer from last year for the Yacht Club events that indicated they had games, a pool party, Halloween character meet and greet, a costume contest, movie and trick or treating.