Oh dear, it seems she is calling the shots here, and it is YOU that wants a relationship.
I am guessing, you really like this girl, and maybe haven't had a girlfriend for a while? Really want some companionship, someone to be with, etc. It sounds like you are too full on.
Cut the crap, there is no good time for a relationship to come along, it just happens, you don't plan it. She is tagging you along. The next two weeks will leave you living in hope, then in 2 weeks she still wont of made up her mind. Some here have said it and it's true.... Get out, get away from this bint and have some fun. Tell her you are taking some other girl to this ticket event now, and find one to take.
Make sure she hears about your wild nights out, having fun, etc. Make it like you have moved on. Woman thoughts then kick in; "Why has he gone off ME!?" "Has he got someone else, someone better?!" and most importantly "What's wrong with ME!!?!?!" she will then all of a sudden try and see you, or talk to you, put her off a bit, tell her you can't see her on XX date as you are busy, but might be able to see her on XX date. Act civil, but don't let on you want to get in her knickers.
Being aloof goes a long way. Girls like mystery.
Don't continue wrecking your head, or you will loose all confidence in yourself when you get out there agin, and confidence is more attractive than anything.
May the force be with you.