Good starting point for a discussion, Dick. I look forward to hearing from other organisers.

'Guest', I think Dick is referring primarily to 'acoustic' - that is, unamplified - music clubs, so a PA and someone to 'do the sound' aren't required. Certainly when I started in folk music, no-one would expect a PA in a folk club (a concert is a different matter). I still prefer non-amplified music except in special circumstances.

Andrew