I'm "room mom" for my son's preschool classroom for the 3rd year now, so you'd think I would have a ton of ideas already, but I'm always looking for something new or fun.
Here's what we've done in the past:
1. Musical chairs to spooky Halloween music.
2. Tie gummy worms to a string and hang them from a witch's broom handle. The kids have to keep their hands behind their backs and race to see who can eat their gummy worm the fastest.
3. Pin (velcro) the face on the pumpkin.
4. Bean bag toss where the kids try to get their orange and black bean bags into those little plastic jack-o-lanterns.