TheConFluence Covers. Mickeys Halloween Party, October 8, 2013, at Disneyland Park, in the Disneyland Resort in Anaheim, California. Take a look at many aspects of the event, including Trick-or-Treating, Treat Trails, Mickeys Costume Party Cavalcade, Disney Villains, Monster U Dance Party, Cadaver Dans, Phineas & Ferb, Nightmare Before Christmas, Jack Skellington, Mickey & Minnie, Star Wars Stormtroopers, etc.