I commonly search for event ideas that are unique and out of the box. I learned that Youtube is definitely a wonderful source for this sort of ideas. All you need to do is browse Youtube and perform a search for "event suggestions" and you can find many hours worth of movies with lots of outstanding suggestions. The trouble is, who has the amount of time to see them all? So I am on a continuous quest to put together some notes in order to save me and perhaps others some time.
Here is an awesome video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you find several great ideas for your upcoming gathering on Youtube!