I agree with RichM. I would be astounded if I attended any sort of "performance" and there were absolutely no provisions for electrical amplification.

I remember a performance by Major Contay and the Canebrake Rattlers years ago. The person who booked them had forgotten to also arrange for sound. The venue itself had no sound equipment. They put on a great purely acoustic set. Probably one of the few groups who could have carried it off.