I think I'm going to pass on this weekend.
Have fun whatever you do. I figure if I'm having fun I'll keep shooting and if I'm getting more heat than I can shrug off then I will quit early.
Attended an IDPA match at Redbrush a few years back where 2 folks got sick from the heat and had to be driven to the air conditioned club house, and also a USPSA match at Riley where the match got interrupted for an ambulance run due to heat exhaustion, I believe that gentleman got an overnight hospital stay. It is a thing.