If you're only getting out to one session each month, even a handful of songs should ensure you don't have to sing the very same song month in month out. Personally I think it pretty selfish of anyone to expect the poor audience to endure the same song over and over again, and not try to learn at least a handful of songs! I can't imagine what satisfaction peddling out the same tune can be for the performer either, don't they get sick of singing the same old thing repeatedly? As a slow learner it takes me ages to set something to memory, so I don't get that many new songs learned each month. But I do hopefully learn enough songs so there will be a couple of new ones whenever I get out to sing. If it's a long session, then I see no shame in repeating some songs already sung before amongst the same group. An all day meet and a smallish circle makes singing a fresh half dozen or more songs unrealistic.