What should my friends and I do for Halloweekend?

Hi, all! I just moved to Chicago about three months ago, and I'm inviting some friends into town on Halloweekend. In the hopes of making it worth their time, what are your recommendations on Halloween events in the area?

I saw that Death by Disco event- is that something that would be worth it? Or are there other events worth going to.

For context, we'll be a larger group, over 21, hopefully all in costume, and looking to party on both nights.