I regularly look for event ideas which are out of the ordinary and out of the box. I found that Youtube is generally a wonderful resource for this kind of tips. All you need to do is head to Youtube and perform a search for "birthday party ideas" and you can see several hours worth of movies with lots of awesome tips. The issue is, who has time to watch them all? Thus I am on a regular mission to collect some notes to save me and also perhaps other people some time.
Here is an awesome video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you see several good tips for your future celebration on Youtube!