The mere fact that she came to the show, talked you afterwards, and agreed to go out again means that she's still into you. Relax. The fact that you were so busy onstage probably added to your appeal, and it seems like she was completely cool with it.
Also, it was cool of her to give you a heads up re: the friendzone guy--obviously he wasn't any threat (if he was, why would she be on match.com??), and considering she was going to be by herself most of the night, it would be ridiculous to expect her to come along. Band shows aren't really an ideal first date IMO.
This is an example of when it's better to ignore the alpha male "dogma" and instead rely on your own judgement. If you had insisted she come by herself, she probably wouldn't have come at all--unless she was desperate. It is far better to do what's "normal" in a situation like this--in fact, when a girl is already somewhat into you, ALL YOU HAVE TO DO is not come of like a weirdo. Don't overthink things, and just set up a 1 on 1 date with her.
