Use this preparation checklist to make sure you are ready. The camera is ready. If you really did prepare your camera as just suggested, then you'll likely be ready also. However, if you haven't used your camera in several weeks, then you may want to review the camera manual to be sure you remember how to work it. After all, you don't want to be fumbling and frustrated to the point that you miss picture opportunities and ruin your enjoyment.
Graduations are emotional.
And with emotion comes stress, so the best advice is to prepare for the picture taking well ahead of time and then relax and go with the flow of the event. In short, don't become obsessed with the picture taking to the point it interferes with your enjoyment. All you have to do is follow it. Many schools tightly control the ceremonies, making it difficult to get close enough to take a picture of your offspring receiving the diploma. Afterwards, your graduate, resplendent in cap and gown, and clutching that diploma, will be yours to photograph to your heart's content.