My last concert I remember going to was very sweaty affair. (even though it was indoors). I think it is fun to have some hair to shimmy around, so I would opt for a half up, half down bohemian vibe. Maybe french braid (or french rope braid only pulling sections from the front of your hairline) your bangs and front layers (with hair parted to one side) braid down to the top of the ear, then braid regularly (or rope braid regularly down the length on both sides (the one off while you do the other). Then take a regular pony tail holder and tie the two together across the back of your head, over your down hair.
There you have it! A style that keeps the air out of your face, still looks modern, but keeps the length down in the back so you can show it off and you have something to move around should you feel like dancing around
I quite like this hairstyle with rope braids.
I should say that this style works for me and my hair is barely 24 inches and it has lots of short layers, my hair is also very slippery, it holds just fine.