If you are talking about the October PD here in S.E.Iowa, EVERYONE IS WELCOMED to come plow. The Poppin'Johnnies/ Classic Collectors Clubs has been doing this plow day since 2005. The event has been flooded out a few years because the plow grounds are located right next to the Des Moines River.
Just for the record, we actually have TWO garden tractor plow days here in Ottumwa in October. The first one is held during Harvest Days at the Dave Cobler farm 3 miles due north of town. This is held on the first or second weekend of October depending on the weather (Bathrooms/food at this event). The second one is the one we advertise to everyone for all types of equipment to come plow. The second plow day is held the third or fourth weekend in October, depending on weather and flooding(food/bathrooms at this event also).
I'm taking care of both events this year and will post more information next summer.
Paul