They use USAP rules. Just about all the clubs in the Northwest run USAP rules with 3, 4 and 6mph classes. I think there were 100-125 hooks yesterday at that pull and it is also a two day event. I had to get pictures taken today with the kids, otherwise I would have been tempted to stay. That show is at Wilcox Farms, which is a huge supplier of eggs in our area and has been there for over 100 years.
You are correct, we do not get extreme temperatures very often and it went from cool and very wet to blistering hot overnight. All that moisture has made it very humid for the past few days. Only saving grace were the tall trees around the track (we grow 'em big out here). We don't have A/C at my house and it has been miserable. It is now the dry season, won't see rain again until the 3rd week in October.