Okay. Seriously. No April Fool's Joke. This looks like fun. It's an event called JustPlay! My mom's work takes us to lots of different kinds of events, but I don't remember any that had stuff like this.
The website says there will be more than 100 free activities. Even for my friends in my hometown this would be worth the drive. Mark your calendars for this one.... two days of fun in Carol Stream, IL on May 19th and 20th.