Denise from Mouse0403 on Etsy let me know that Pleasant Prairie (first town north of the Cheddar Curtain on I-94) is having a farmer's market/craft fair on Sat July 23rd (Prairie Family Days Market/Fair). The registration before 5/1 for a 10 x 10 booth space is only $10. It is juried and, because it is outdoors, they do stipulate that you must have a 10 x 10 canopy.
I don't know the size/attendance of the event, but since the registration price is so low, it might be a good inexpensive opportunity for crafters to fill out their event schedule this summer or as a first non-Etsy vending foray for someone looking to make the leap to a real live craft show.