You need earplugs, fast glass, no flash. Earplugs are the most important of the 3. In front of big speakers for work = not good without protection.
Don't be afraid to crank the iso, A or M mode, spot metering, blast out as many frames as you can. Good holding technique and shoot particularly when there's lots of light (eg crowd blinders are up, though the light outta them is kinda ugly)