Thanks for all the info. At the gig yesterday the sound guy also mentioned he has had his shut down due to heat. I didn't realize that was an issue also. I did notice something too that made me feel like an idiot. I could not figure why even trying to run the mixer app on mine, I could not see it. Then I walked over to the other guys iPad (with my sun glasses off), was like, man, I can see yours just fine. Walked back over to mine, (sun glasses off), and realized, ugh.... with the glasses I was using, the screen is completely black with them on. Oops...
I will say playing outside is a learning experience as in what to try and account for. I had printed off all my music assuming I would not be able to see my iPad well enough. Ended up using the iPad has a paper weight for the music most of the time as the wind picked up pretty good. Enough to blow over music stands. I could ditch the music and just look at the iPad with my glassess off, but then had the sun directly in my eyes. And its fun trying to play when a bug lands on your neck and you are trying to swat it off. Then a second later, one is on your arm...
I don't care for trying to look at music or an iPad at all and just memorizing it. In this case we got the music the day before as the singer was sick and had to redo the entire set so the drummer could do all the vocals. I was able to spend about half an hour trying to practice it all between work and other things we had going on. Arrangements on some tunes ended up being different than the recordings. All in all, it turned out pretty good. Although a few songs we were all looking at each other going, ok, what are we doing now? But made it work given all the circumstances. Was a balmy 95 and humid.