[Home - Midwest Old Settlers & Threshers Association The Midwest Old Settlers and Threshers Association was founded in Mt. Pleasant, Iowa in 1950 with a gathering of 15 steam engines and 8 separators. The annual Midwest Old Threshers Reunion always held five days ending Labor Day, is one of the largest celebrations of our agricultural heritage from steam engine, tractors, cars & trucks, gas engines, horses, electric streetcars, and narrow gauge steam trains and attracts visitors across North America and around the world.]