Big time! There's a common question musicians get. "Are you booked such and such date?" It's the absolute worst because after saying your schedule is free, if you turn down whatever work they're offering, you're clearly just saying they've offered you a shitty gig. I just always answered yes to that question. If they've got something worthwhile, it's worth subbing out my other gig for.

great links. I think I’ve seen them before, or at least others very similar