I usually look out for event approaches that are out of the ordinary and out of the box. I think that Youtube is generally a great resource for such tips. All you will have to do is browse through Youtube and perform a search for "birthday party suggestions" and you will see several hours worth of online videos with many very good tips. The issue is, who has time to see them all? So I am on a continuous quest to compile some notes to save me and perhaps others some time.
Here is an awesome video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you see a number of good ideas for your upcoming party on Youtube!