I often seek out event ideas which are unusual and out of the box. I think that Youtube is without a doubt a great source of this sort of ideas. All you will have to do is browse Youtube and do a search for "event tips" and you can see many hours worth of clips with many exceptional ideas. The issue is, who has enough time to view them all? So I am on a regular quest to gather some notes in order to save me and also hopefully other people some time.
Here is a great video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you find some great ideas for your next celebration on Youtube!