S.H.
teach the kids how to do Michael Jackson's Moonwalk!
have them play Freeze Dance...by pretending they're floating thru space. Lots of photo ops with this one.
Buy yellow sponges & decorate them like SpongeBob...& use them as decorations everywhere!
Use poster board to create a "Pin the star/moon/etc on SpongeBob".
Hand out star stickers as prizes....the kind teachers use for grading.
What's that phrase? "Shoot the Moon"? Have the kids use water guns to hit a moon-shaped target. Decorate the target with a point system.
Oh, wow....I could go on & on. Love parties!