I typically want event approaches which are unconventional and out of the box. I think that Youtube is generally a very good source for these ideas. All you will have to do is visit Youtube and perform a search for "party suggestions" and you can see many hours worth of movies with many different outstanding tips. The problem is, who exactly has the amount of time to watch them all? Thus I am on a regular quest to gather some details to save me and also hopefully other people some time.
Here is an awesome video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you see a number of good tips for your next gathering on Youtube!