is a kindergarten graduation cum concert, parents will flood at the front of stage with all sorts of cameras, compact, handphone, videocam when their child is on the stage.
just get a camera with a lens you are very familiar with, plus a powerful flash will do. cause beside frighting with many other parents for better position to shoot, you kid may not always stay at the front roll, and also dancing, moving at the same time, so you have to shoot very fast, no time for you to slowly compose, think of what setting to use. shoot with available light? you can forget about it, unless you are very good at this.
don't forget to lower yourself when you are not shooting, so other parents can enjoy the shows as well.
Hope this help.