hey guy,
so first of all, everytime she's reinitiating the contact, and she's the one, that invited you to this event, so just like you thought, that are IOI's. Also her response to your question about that backstage-pass.
So go for this one, and it'll be on.
Second of all, to know, if she's into you, more than a friend you have to look for her body language for instance.
Is she doing kino ? Like touching you, when you both are laughing, or uses other excuses to touch you, or maybe touching you without any reason for it, like tapping your shoulder as a sign of agreement.
Next is she laughing even about your bad jokes ? Is she qualifying, like trying to tell you all her good sides, even if she hides it in storys.
And another thing I learned trough studying the human body language and psychologie. Look for signs like, the rising of her pupills when she sees you, the color of her face when she's with you, is she making eye contact, playing with her hair. Look (not too obvious) for the postion of her feets, are they turned in you direction ? or is she tapping, can mean shes excited.
And a thing that is always a great indicator for me, her breathing. You can read it from her shoulder movement.
And last you could touch her pulse to escalate and also to look for its speed.
Just take her hand, touch for the pulse. "and say: Oh I know it, you're into me" or "Got you, but now stay calm;)" or anything else
