An update from a friend on the band's dress rehearsals with stadium amplification:
We've experimented with the sound amplification twice this week at stadium rehearsals. Unfortunately it's really hard to get a read on things without people in the stadium. Right now there's a significant delay between the actual sound and the amplified sound. It varies from minor to almost a beat late depending on where you are. It seems to be worse the lower you are in the stands for some reason, and it's also pretty bad anywhere on the east side. We'll have a better idea of things after the first game tomorrow.
I hope things go well; it'll be interesting to hear reports from stadiumgoers.