Shim,

Generators are not the way to go. They are noisy, load restricted, frequently surge, and could cause lots of equipment damage. Heavy-duty DC to AC inverters are your best bet. No gas, no noise, very reliable. I performed some campground parties where the closest outlet was more than 600 feet away and the inverter worked flawlessly using a large truck battery for the primary power source. Keep in mind, however, that high-wattage inverters are not cheap. Therefore, if the job is a one-shot deal, I would tell them to provide you with electricity or find some an acoustic country band.

Gary