"For the weekly open mic, a $3 cover charge was requested of all but the musicians who were exempt; the cover charge went entirely to the music organization.

The monthly concert had a $8 cover charge and the total door was split 70/30 between the performers and the organization.

The restaurant received no money from the organization, but benefited by increased business. "

If the restaurant saw no increased paying business than they need to find a way to resolve the problem or stop the concert. From their point of view the music organization is renting their space for free. However, I would be upset at paying a cover and having a minimum as well...how about charging EVERYONE a $4 cover and sharing it with the restaurant.

p.s. Although I am glad to hear live bands and order food and drink (see the performers drinking thread) I am loath to pay a cover charge on open mike night...actually I generally dislike cover charges but will pay it for a specific band I want to see...I can see the cover driving away the regular restaurant business.