A concert is not the prom (or “da club”)

Dress for the occasion. Don’t be that girl who’s wearing 6 inch heels and a skirt so short if she bends down bad things happen —and don’t wear a long flowy dress like you’re about to party your final year of high school away. Who are you trying to impress? The performers that you came to see? Pluheese girl.
Keep it practical and you’ll feel better. Comfortable shoes will keep you stable. Remember, you’ll be standing for several hours which is pretty unnatural. You’ll stand for hours in line—even with small performances—and during the majority of the show you’ll probably want to stand and dance a bit. Any kind of pain will detract from your enjoyment. Be comfortable first.