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Matt, I just saw this today or I would have posted earlier. I have shot the same sort of exhibitions the last 2 years at the Edwards Jones Dome and trust me brother, the 6 minutes goes by in the blink of an eye!! Shoot EVERYTHING YOU CAN SHOOT while they are on the field and edit out the bad stuff later, because most of these kids may never get another opportunity to play on a stage like this. My biggest problem the last 2 years is when you go in and take all you your readings, they already have all the TV lights on for the Rams. The light is pretty darn good as you can see from my first image (if the EXIF shows up). I knew 1600 ISO would yield me 500th sec. ss but I wanted to play it safe (and also because your adrenaline kicks in knowing you've only got 6 minutes to get these shots for 25 kids) and my camera would handle 2500 ISO with minimal noise so I opted for ISO 2500 1/1000 ss at f 2.8 or 1/500-1/640 sec at f 4.0.
Here's where things get interesting though. After the kids have been on the field for a minute or so....THEY KILL MOST OF THE LIGHTS!! You go from beautiful light one minute to ISO 6400 just to get 1/320 - 1/500 sec. ss. Shoot in RAW just to be safe because your WB will look horrible in there shooting Auto and even if you do a custom WB, you'll be screwed once they turn the lights off anyway. They may not turn them off on you, but it happened to us 2 years in a row. Just be ready. Best of luck and I may see you there. I'll be shooting that night as well.
P.S. Both of these are out of camera with no post processing. I just wanted you to see the difference in the light, as I thought this would help you more than seeing to perfectly color corrected images would.
With TV lights on.
When the lights go out!!