Here is some info from last years party. Not sure if the new schedule is out yet but this should give you some idea.
2006 Schedule of Events
Boo! What? Where? When?
Trick-or-Treating: Goodies for your ghouls. Locations indicated on the map.
Mickey's "Boo to You" Halloween Parade: See favorite Disney Characters in a special Halloween Parade. Parade steps off in Frontierland at 8:15 and 10:30 p.m.
Happy HalloWishes -- Grim Grinning Ghosts Come Out To Socialize: The night sky lights up high above Cinderella Castle with a Halloween fireworks spectacular. You never know who will appear on a night like this. 9:30 p.m.
Halloween Dance Parties: Dance the night away with Disney Character friends. Stitch's Cosmic Dance Party (7:00, 8:00, 9:00, 10:00, 11:00 p.m.), Cosmic Ray's Starlight Cafe, Tomorrowland Get Up And Boo-gie Dance Party, Ariel's Grotto, FantasylandVillain's Mix and Mingle: Your favorite Disney Villains take center stage in the Halloween production -- stick around, you don't know WHO you may meet after the show. 7:45, 9:00, 10;15 and 11:15 p.m.
Merlin's School of Wizardry: 7:00, 8:00, 9:00, 10:00, 11:00 p.m.
Special Disney Character Appearances: See some new Disney friends, as well as some old favorites as you've never seen them before. Throughout the Park.
Linda