I would do stations with different Disney characters driving the stations:
Princess Station - make a crown, make a wand, etc. Or you could even break this into individual princesses - Cinderella - Make a crown. Snow White - Poisoned Apple (like Hot Potato). Jasmine - Magic Carpets (like musical chairs).
Mickey/Minnie station - you could do a treasure hunt fashioned after Mickey Mouse Clubhouse tv show. Or maybe figure out a way to make Mickey Ears?
Donald/Daisy station - play the duck game (like a board game) or play Duck, Duck, Goose
Alice in Wonderland - Tea party, make Mad Hatter hats, play crouqet
Treat/goody bags would be easy - you could make Mickey Rice Crispy treats, buy Mickey or Princess fruit snacks, Target Dollar Spot & Dollar Tree always has Disney stuff - watch for these to go on 30%, 50%, 75% off, also little nail polish, lip gloss, etc. Another idea is to find out what McDonald's is using for Happy Meal toys between now & then - something might fit into the theme.
You could tell everyone to come dressed as their favorite Disney Character and have a character parade through the house or around the block. Most of the little girls I know in the age group seemed to go as a Princess or some other Disney character for Halloween so this should not be a problem. Play Disney Birthday music, etc. You could also burn a copy of the cd to put in the goody bags.
