I was in the 4-H club in Healdton, OK, when we had a 1940 John Deere L tractor, but I only showed Berkshire hogs and some chickens at the fairs and fat stock shows in Ardmore (Carter County). I don't remember any kind of contests like that described in Denton.
When I was doing gas leakage surveys, we spent about 3 months in Sayre, PA, and on July 30, 1993, we went to Troy, PA and spent the afternoon at the county fair, eating sausage sandwiches, catfish & butterfly fries, gyro sandwich, fudge, and lemonade. We watched the sulkey and wagon timed races around traffic cones, backing up, stopping at a mailbox, etc. Then we stayed for Tim Rivers' high diving mules; 3 mules that dived into 6 feet of water from a 30 foot platform (and one dog, too). No tractor contests, but the horses & mules put on a very interesting show and we thoroughly enjoyed the afternoon.
So I know Pennsylvania has some good fairs.