The Olmsted County Fairground hosts the Gold Rush shows twice a year in Rochester. They claim to be the original gold rush and Oronoco claims to be the Gold Rush show. I have no idea who really gets to claim the title, all I know is it means more antiques than you could ever see in one area.
The fairgrounds show is usually in May and then also again in August during Gold Rush days. Most of the dealers are in buildings for this show so the weather is never really a factor.
The items here are amazing! A crazy quilt that was the best I had seen outside a museum. A Scandinavian table and chairs that I would have loved to put in our home.
The show is open on Saturday and Sunday the third weekend in August. We usually close our booth down early one night to go show at this show when at Oronoco.
More information can be found here: http://www.townsendshows.com/