Re: Strange little professional problem
As a professional you should have some kind of contract, or rider, protecting you from this kind of thing. I would think that every detail of the working arrangement would be spelled out and signed by all parties involved. You have to protect your ass, its business. I can only imagine what else this band leader may try and pull. He may end up trying to stiff you, and you have no way to protect yourself legally.
I would definitely contact him asap and make sure you are on the same page. Then get it all in writing as soon as you can. Remember, they need you more than you need them. Expecially now with only one rehersal left before the gig.