Suggestion;
Rely on others in the folk music business and you will continue to experience frustration..   Why not do this. Form a troupe of performers you know and stage your own shows. I am in the process of doing this right now thanks to my son's theatrical experience. You can put together various combinations of solos, duets, trios, etc. Everyone doesn't have to perform every time. Share the promotion, booking, etc among you. Build up your own audience- It's like a company of actors. Because of the limited appeal for folk music and usual lack of appreciation by venue operators, it's up to you unless you think you are such a unique talent that the world should come to your doorstep.