If you can, go on one of the weekdays, as the crowds are somewhat lighter than on Saturday. The daily schedule for the 2000 reunion is available here . The sooner you get there the lighter the crowd. This is not a static museum. After turning, you cannot park on the left as that area is for exhibitors only during the Thresherman's Reunion.
Parking is available on the right, opposite the side entrance to the grounds.
However, this lot fills quickly, especially on Saturday, so you may be waived on to park in a field of a nearby farm. If you have to do the latter, you'll enjoy a ride on a farm wagon back to the grounds. Many tractors and wagons ensure very little waiting for these rides. Food - There are several food pavilions on the grounds operated by local organizations and Rough and Tumble. There is relatively little commercial activity on the grounds itself other than food concessions.