I usually look for event ideas that are unconventional and out of the box. I found that Youtube is undoubtedly a very good resource of such tips. All you have to do is head to Youtube and do a search for "party suggestions" and you are going to find hours worth of videos clips with various fabulous advices. The trouble is, who exactly has time to view them all? Thus I am on a constant quest to gather some notes in order to save me and perhaps others some time.
Here is an awesome video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you find a number of good ideas for your next gathering on Youtube!