I normally search for event approaches which are out of the ordinary and out of the box. I found that Youtube is certainly a great source for these ideas. All you need to do is browse through Youtube and perform a search for "birthday party ideas" and you are going to see hours and hours worth of video clips with countless excellent suggestions. The issue is, who has enough time to see them all? So I am on a continuous mission to collect some notes in order to save me and also perhaps others some time.
Here is an awesome video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you see several good ideas for your upcoming party on Youtube!