Sorry to hear about it being so warm in the arena. As someone who attends multiple shows, I can say with certainty that the temperature varies from venue to venue. My memory is very vague on this, but a few years ago I remember seeing a copy of a contract rider for the band. I'm pretty sure there was a clause that said the showtime temperature in the arena should be 72° (I think). Now, granted, this was a few years ago, but my point is, even if the arena has the thermostat set at a certain temperature, that doesn't mean the heating/ac system or thermostat are working properly. Stuff happens that is beyond anyone's control, but, my guess is that these cases are exceptions.