A cautionary tale about cameras and concerts, in which I was refused entry to the O2 ABC in Glasgow with my camera due to 'new' venue policy. I don't use a DSLR, but I had my GX7 with a 60mm lens fitted which is not that big.
I assume they are concerned about shows being recorded, but you can make decent video with a smart phone these days and there was no ban on them. In the end I had to leave my camera in my brother's car (thanks for the lift and all the rest Al!)
So all I can offer is a grainy 'phone shot...