Like yourself, I have tried to get a mixed supper club off the ground, but had no replies. I think the problem is that if you have young children, a woman only group may be better, so that OH can babysit etc. , but for us older members, who have moved to new areas, the supper club could be a general venue to make new friends. There are no rules that say it has to be single sex, no more than men joining the general discussion forum.