The Minnesota Inventors Congress has announced the dates and location of its 57th annual Invention Expo. It will take place May 2nd and 3rd next year at the Minneapolis Convention Center. The move to the Twin Cities was announced last month in an attempt to select the best venue to meet exhibitors’ needs. The Minnesota Inventors Congress is the oldest annual invention convention in the nation. The internationally-recognized event is designed to help inventors test market their products to the general public, and also includes inventions designed by Minnesota elementary school students.