A right can of worms this one Acorn4. No matter which way you jump you're going to upset someone. So, my twopence worth would be.

1. The Guest and some audience managed to get to the club, thus anyone who booked and paid in advance presumably could have done the same, therefore no refund. The same applies for someone who "forgot" their problem not yours.

2. Do not allow people to "reserve" tickets without payment up front.

3. Accept that in future, no matter what you do, it will be the wrong thing.

Cheers

Raggytash