Dancers: Buy a large cake, and hidden inside is a party dancer, they are sexy, both male and female. But if a kid is at home, a gorilla will appear instead. They will flirt with your Sims, married or single!
Drew Carey: He will appear if you're throwing a great party. He will come to your home in a limousine.
Ghosts: Have a creative Sim tell a good story around the campfire, and a ghost might appear!
Mime: Throwing a bad party? The mime is here to crash the party and try to make it better. Beware of his hands, though, as he will steal items from your home!
Caterer: Hire a caterer to keep the plates full at the debutante ball.
Party crashers: Pete or Paulette might drop in when a party starts getting good.