Gainsborough is a category 3 club and we used to have a problem with many of our regulars not turning out for guest nights. We seem to be over that now. One thing we have done which seems to help is a "half guest" night. (Singaround for first half followed by less well known guest for second half). Our regulars now seem to have confidence in our choice of guests!
Our main problem now is the increasing age and level of ill health of our regulars. If anyone has a solution for that one I'm all ears!