Guy here. Eye contact. If they're making a ridiculous amount of eye contact they're at minimum into your vibe and you got a shot. Doesn't mean she's even thinking about getting with you but the door is cracked. Above ALL else just play it cool and keep doing you bc you are the reason she's looking. And remember, it doesn't matter if anything comes out of it or not, if you both have fun it's a win! Dance and vibe with her and see where it NATURALLY goes. If she's interested she'll let you know. Even if you just make a new friend she'll have friends. Having a few witty one-liners helps but at least talk to her at some point, if not she'll lose interest and move on within a few songs, if she does don't follow her, it's a total vibe killer.

Rarely will a women straight up hit on you and those are the ones I get away from. In my experience, you're not the only one there she's done it to or could even be trying to make someone jealous. it can lead to pointless drama at the end of the night.

Engaging with friendly people around you on a consistent bases, not only at shows but everywhere you go, will make it seamless and help with your self-confidence in random social situations.

If you're super fucked up don't even think about it. Your inability to correctly read the situation will ruin the night for her. Then you're that creep at the show last night. Keep up the hard work and self-improvement. You're starting to see the payoff and it will only get better. SLSL