The short answer is it can be.
Is what you do is in their normal course of business?
A comedy club provides a place for customers to have an enjoyable time. Actors and technician are not their main business.
However, direction and control can be an issue. If they direct and control how you do your job, then all sorts of tax and employment codes will apply. If they tell the comedian to tell specific jokes, and to ware a certain outfit, how to walk and hold their
hand, then they are directing and controlling them. In other words what is the difference between you and the bar tender or the waitress?
As for your situation most likely it could be argued that you are indeed a IC and if your contract is a % of
house, then it is legal.
Although I am not a lawyer and these are not actual case law examples, it should be a reasonable analogy. I would suggest to renegotiate your contract with some minimums dollars or find a different gig.