I typically look for event ideas which are unusual and out of the box. I think that Youtube is generally a great resource for these tips. All you need to do is browse through Youtube and perform a search for "party ideas" and you are going to see hours worth of clips with many exceptional points. The trouble is, who has enough time to watch them all? Thus I am on a continuous mission to compile some notes in order to save me and also perhaps other people some time.
Here is a great video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you see some good ideas for your future celebration on Youtube!