A classic way to celebrate Halloween is to carve pumpkins. Since the carving can easily get out of hand with a lot of kids to manage, paint pumpkins instead. Have everyone wear an old t-shirt to protect their costumes from paint stains. Let them get into the fun of safely decorating their own Halloween pumpkin! Afterwards, set up a display and take some photos to remember the fun. Hand out prizes from Dollar Tree for the cutest, scariest, most colorful, etc.