I often try to find event approaches that are unusual and out of the box. I think that Youtube is normally a wonderful source for this sort of tips. All you need to do is visit Youtube and do a search for "birthday party tips" and you can find hours worth of movies with a lot of very good suggestions. The issue is, who exactly has time to watch them all? Thus I am on a continuous mission to put together some notes so as to save me and perhaps others some time.
Here is a great video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you see several good ideas for your future gathering on Youtube!