I typically hunt for event approaches that are unusual and out of the box. I learned that Youtube is usually a terrific resource of this kind of ideas. All you need to do is browse Youtube and perform a search for "event ideas" and you are going to see hours worth of video recordings with plenty of wonderful advices. The trouble is, who has the time to view them all? Thus I am on a constant mission to compile some notes in order to save me and hopefully others some time.
Here is a great video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you find a number of great tips for your future gathering on Youtube!