I was with you until the last sentence. Wouldn't not allowing them to work full time make them employers? I guess they could word the contract so that the only time there was space available was for less than full time.

They are not employers, because they do not pay the dancers. The dancers pay them. I do not know why they do not allow full time work. Perhaps they want more different faces during the week than they would get if they had a smaller full time group of girls. Or perhaps there is some law that regulates people who work over 25 hours a week.

There is no contract. The dancer shows up each evening and the owner either accepts their $75 and allows them to perform, or refuses it and does not allow them to perform.