Welcome to AA. Great choice on your AEG.
There are many cooler, and even cold areas to play airsoft at. In the 'winter' (What, 80o F?) it can feel pretty good, and you can play all day depending on the area. We have Bushnell Tanks, Prescott, SASCO (CQB) Southern Arizona Smelting COmpany, pretty damn fun place too, but its in Tucson.
Non-official games (No age rules) usually have anywhere from 8-40 players (OP: Dragonshead?
) Official games I know usually have a constant 30-50, with the yearly big ops running 200-300.
You seem more educated than most of the people (children) that join here asking about nades, deagles, and clips. So Thank you, and I'm sure you will have fun.