if you are running a rig, get 2 clamps for the cams, mount them on your stand (needs to be very stable) below your gear. Focus one cam on the the entire stage and one on maybe a guitar/singer. This works well if you are slightly higher than the stage. This also give s you control of all your gear and zoom away if needed. If you have a 2nd tripod/stand you can set that up directly next to your gear and put the 2nd cam on it. This works well if you need to pan around the stage and don't want to be shaking your stage view cam.
I'd suggest picking up a wide angle lens for your camera, you will be happy you did. The one I picked up for my Sony was $25 from B & H, and it helps out in close situations.