The sale has been canceled. Northeaster will update the public if the sale will happen in the future. Original event notice: Wayne E. Potratz, professor emeritus and scholar of the College Emeritus, Art Department, University of Minnesota, exhibits nationally and internationally and teaches workshops in metal work at CAFAC and the NHFS. He's lost his lease at Studio 15 in the Foundry Building, 1101 Stinson Blvd., and will hold a three-day sale of art, sculpture, antiques, curios and tools. Friday,…