Thanks all for your comments and keeping away from some of the silly back biting I have read on other threads.
My own view is that if 50 male voicers turn up then 50 spots it is, but because I think in most cases combinations are more interesting than solo performers then I would hope that they would do some songs together within the 50. I also like the idea of giving them a time spot if the situation is appropriate.

I think with the one go each rule it is not really worth my while turning up just to accompany someone else, unless there is really nothing else to do that night. They are nice people, and the raffle is good.   
Signing off now as we are booked elswhere this weekend.
FloraG