It's part of the deal.

Part of the reason that I pay a $5 cover to get into your shitty bar that I hate is because you have a band there. A band I presumably would like to see. Now when the band decides to pull out last minute for a medical reason you can't still collect $5 from me. That's how this shit works. It would be like if you went to a bookstore for a book signing that was going to charge people $5 to see the author. But at the last minute the author pulls out and you still charge $5 for people to come into your bookstore. Fuck you and your shitty overprice overcrowded bar, it just reminded me why I don't fucking go there in the first place.