Just a reminder. Officially reported temperatures are taken in such a way that the readings are in shade, and not in direct sunlight. You need to add at least 10 to 15 F to approximate the air temperature in sunlight.
If it was 79 F in the shade, then 90-95 F was the likely temperature in direct sunlight. My guess is that the Racers were hot both from the kangaroo costumes (which make it difficult for the body to cool itself while being worn) and the outside tasks which were in direct sunlight.