Decorate. There are many different old and new WWE party decorations available. From posters, napkins, plates and banners, you can deck out the whole party setting with WWE merchandise. You can even find WWE cake pans on eBay that can be used to create Hulk Hogan, Macho Man or Big Bossman cakes.
Play party games. Many traditional birthday party games can be adapted with WWE themes. Instead of pin the tail on the donkey, replace the donkey with a hated WWE wrestler like Edge, Mr. McMahon or Ken Kennedy. You can also play musical chairs with WWE superstar's theme songs instead of regular music.
Duplicate a WWE ring by renting a moon bounce for the day. Children can bounce around and safely replicate their favorite wrestler's moves. There are many different kinds of moon bounces, even a Hulk Hogan one that replicates a wrestling ring.
Invite a wrestler guest. Instead of a birthday clown visiting the party, a dress-up wrestler can visit instead. To make the children think that the wrestler is actually who they are, dress up as a masked wrestler like Kane or Mankind. Show up, pose with the kids and talk about a couple of feuds for their enjoyment.