The 2012 Potlatch will be held November 2nd - 4th. Potlatch is a regional festival held by the Great Lakes Region of Puppeteers of America. It is held at Potawatomi Inn in Pokagon State Park. You can read more about the event in this PDF form that includes registration forms for both the festival itself and for hotel reservations.

I've never attended this festival but I've always heard good things about it. If you have attended in the past please let us know about your experience.  The Potawatomi Inn looks like a pretty cool setting for an event.