seen a picture of the moon taken at night? This concert is basicly the same situation. It doesn't mater if you are in the dark or around your subject is dark as long as what you want to take a picture of is well lighted and you set your camera to the right setting. I have taken many pictures of fireworks late at night such as at Disney World and they come out great. All you need is the subject lit up properly and your camera set right. It's not any more complicated than that. Sometimes we make things out to be harder than they really need to be.