I normally look out for event ideas which are unusual and out of the box. I learned that Youtube is undoubtedly a wonderful source of these sorts of ideas. All you need to do is go to Youtube and perform a search for "event suggestions" and you are going to see hours and hours worth of movies with countless awesome ideas. The problem is, who has the amount of time to view them all? So I am on a continuous quest to put together some notes in order to save me and hopefully other people some time.
Here is an awesome video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you find a number of great tips for your next occasion on Youtube!