There are a few Michigan brewers around, that's for sure. Unfortunately, most of them are Trolls. They've been ok with me crashing a party, though. I keep threatening to go down there for a brewday, but haven't had the time yet. The Michigan brewers around here are the coolest people on the intrawebs.
I'm from Houghton - unfortunately no longer living up there! I think the long UP winters create a lot of drinking time... probably lots of brewing time as well!