Hi Gina!
Thanks for stopping by the Disney Parks Moms Panel.
Mickey's Not-So-Scary Halloween Party is a fun, family-friendly Halloween celebration where you can trick-or-treat in Magic Kingdom, see ghosts hitchhiking their way down Main Street, U.S.A. in Mickey's Boo-to-You Halloween Parade, enjoy the Cadaver Dans as they entertain Guests in the theme parks, enjoy special Character experiences throughout the park and experience many more fun (and not-so-spooky) Halloween events. While the attractions available during the party can always change, currently
Stitch's Great Escape is not listed among the Mickey's Not-So-Scary Halloween Party attractions. However, surprises are always in store for Walt Disney World Resort Guests. So I recommend that while you are in Tomorrowland take a peek a the attraction entrance to see if Experiment 626 is causing havoc during the party!
Normally, I would wish you 'T-T-F-N, ta ta for now', but in the spirit of Mickey's Boo-To-You Halloween Parade: Boo to you, and you, and you, and you. Happy Halloween!
~Crystal B.