Don't know much about aid and rock concerts, but just be thankful you weren't around during the Chicago marathon.:unsure:
I agree, that must have been a mess. On Sunday I was volunteering at the Boston Half Marathon, where we were expecting the same temperatures as Chicago. It was a real pity-- we all showed in shorts, and it was in the mid 50s and very windy. The runners were fine, the medical staff spent the race freezing our butts off.
...We almost ran out of mylar blankets.