M.,
Take a plastic glove (not a latex glove, more like a food service glove) and put a candy corn in the bottom of each finger, (this is the fingernail) then fill the glove with popped popcorn till its almost full, tie it off with a twistie tie or rubber band and then put a spider ring on one of the fingers.
You could do face painting, paint small pumpkins, bats, ghosts, etc. on the kids faces.
Fill a jar with candy corn and let each child guess how many are in the jar, closest guess wins the candy.
Read a good halloween story.
Play musical chairs using the Theme song to the Adams Family.
Decorate small pumpkins, either with markers or stickers.