gee, sorry. hope your show wasnt tonight.
to ground it, there will be an actual ground rod that will need to be driven into the ground. i think the recommendation is something like 6-8' (as in, feet deep), but that is kind of impractical, as you would need machinery to extract it. you wont be pulling it out by hand, and might need a sledgehammer to drive it. when i did utilities, we had a 10lb sledge head with a piece of 1 1/2" steel tubing welded as a handle. you could then use it almost like a slide-hammer until it got low enough to swing the hammer. sometimes the ground rods are kind of like a corkscrew, but that may or may not be helpful depending on the ground.
as far as the power requirements, you will have to do some math. count all PA (including rack stuff and amps) and lights, too. you may have to guestimate on requirements, as they often arent listed. for example, the supply on my GK 700RB head is rated at 220 watts average and 615 peak. not speaker watts, mind you. dont be surprised if your power amps are rated @ 1500-2000 watts a piece. of course, this would be instantaneous draw, not continuous. OTOH, an average 100 watt tubed guitar head only draws 3-400 watts. the wattage of your lights, however, has to be figured as a constant draw (because they do). if you dont go conservative, you might simply work the $hit out of the generator(s), experience voltage drop (some digital gear has issues, and your hammond might go flat), or worse. or not. depends on how lucky you are, i suppose.
