Fuck, this quote thing is out of it's own arse.
Ok, Concerts.
Only opening I've done in relation to concerts is one of two, Either after concerts.
Either that or taking care of the girl that is crushed between some fatwad and the fence by bracing your arms around her (this has gotten me Kisses but I wasn't at the level that I followed it up).
If you've been to Metal Concerts, being in front of the Mosh, most girls seem kinda petite.
So if you place an arm on the fence, and stand firmly planted, she's got comfort, you've got support in the fence by placing your arms around her and on the fence.
(anyway, that's my experience)
Of course you can pull up to the side of a woman in the crowd, look over across your shoulder and flash them a grin and an upwards nod and go "hey"

(That's one I got from a friend of mine who's a natural. He's picked up 9/10s with that one)