I typically look out for event ideas that are out of the ordinary and out of the box. I think that Youtube is truly a wonderful resource of such ideas. All you need to do is head to Youtube and perform a search for "birthday party suggestions" and you are going to find several hours worth of movies with many different good tips. The problem is, who has the time to see them all? So I am on a continuous quest to gather some notes to save me and hopefully other people some time.
Here is an awesome video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you see several good ideas for your next occasion on Youtube!