Here in the mid-Michigan area, we have:
Linwood Pickle Festival
Munger Potato Festival
Caseville's Cheeseburger in Paradise Festival
Bay City St. Stanislaus Polish Festival
Auburn Corn Fest
Bay City's Pig Gig
Bay City Tall Ships Celebration
Freeland Walleye Festival
Saginaw's Greek Festival
Pinconning Cheese Festival
Kawkawlin River Days (I think they still run this one)
Frankenmuth Beer Festival
Frankenmuth's Winter Fest (in January, with snow sculpting and ice carving competitions)
Tuscola County Bean Festival (and, yes, we have a Bean Queen, too!)
Scotch Picnic in Hemlock
Ohhhh, there are soooooooooooo many around here. In fact, I don't think you can swing a dead cat without hitting a festival in this area on any summer weekend!