I normally search for event tips that are out of the ordinary and out of the box. I think that Youtube is without a doubt a great resource for such tips. All you have to do is browse Youtube and perform a search for "event suggestions" and you are going to find many hours worth of video recordings with numerous exceptional advices. The issue is, who exactly has the time to watch them all? So I am on a regular mission to collect some notes to save me and also hopefully other people some time.
Here is a great video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you find a few good ideas for your next occasion on Youtube!