Forget clowns; there are enough townies that act like clowns.
For parties, I hate that some people, unless you engage them to dance, use computers or watch TV! My sim puts out expensive nectar and asks people to dance, but some play their computer or watch Tv.
What is needed is a game like "Twister". For those who remember it, it was a floor mat and people had to place their hand or feet on certain sqaures. They became completely twisted until they all fell down.
Another party game, is having an orange under you cheek and without hands trying to pass it to the next person under their cheek (usually male then female, then male). Can end up quite hilarious.