Carlus Henry let me know that BarCamp Grand Rapids is being held this weekend. It definitely looks like a good time.
Even if you can't make it to the BarCamp, the site has some great links about what a BarCamp is and how it's organized, even how to organize one yourself.
It's organized as an Open Spaces event, and I'm a huge advocate. It would be fun to be in Grand Rapids this weekend, but a 2 year old and a 4 year old (and their dad!) have my attention this weekend. Would love comments posted on how it goes though!