I routinely seek out event tips that are unconventional and out of the box. I learned that Youtube is definitely a good source of such ideas. All you have to do is go to Youtube and perform a search for "event suggestions" and you are going to see hours and hours worth of online videos with a large number of wonderful suggestions. The issue is, who has time to view them all? So I am on a continuous quest to collect some notes to save me and hopefully other people some time.
Here is a great video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you see a number of great tips for your next event on Youtube!