My favorite was jack murphy stadium in san diego. Got seats in the shade under the overhang, and it was about 65 with a slight breeze the whole time. I wore sunglasses and just let myself doze. Good times.
I remember the Janesville, WI assembly hall. That was good because they were still serving hot food when I was there.
The worst ever was one year in Tucson, we got the convention center in between hockey games. They literally covered the ice with temporary wood flooring, so anyone near the floor seats was miserably cold.