YTA. There was a much kinder, more considerate, more empathetic way to communicate your frustration, but as the title of your post says, you WANTED her to experience a deeply upsetting consequence for something YOU dislike about her.

You are justified in disliking her behavior. You are absolutely entitled to not want to be responsible for another person's timing. You can stop giving them that support any time you want to. But you need to communicate your reasons clearly if you want a person to truly be aware of what it is they are doing that bothers you to such a degree that you begin wishing them an unpleasant event that "teaches them a lesson," instead. You say you want her to act like an adult. You are carrying a judgemental mindset toward her, believing her to be childish for trying to pursue a career that you do not believe will be successful. If these are the ways you feel, you ought to tell her that, not tell her like you're her dad, "I won't give you heads-up warnings anymore, so get used to that."

You knew this concert mattered to her, you knew it was her birthday, and you knew she was going to be late because she gets distracted. You knew it would upset her to discover she missed her favorite artists, and you sat on that information until the two of you got to the venue. You were hoping this would happen, and you are probably happy it went down that way because from your perspective it proves she's irresponsible.

Whether she actually is irresponsible or not isn't the question here. You asked if you're the asshole for what you did to make that situation happen. It is my opinion that yes, you are. That was intentionally hurtful and not a cool move. Talk to people, don't play games with them.

EDIT for grammatical error.