This is not entirely unlike what I had wanted to do for my own graduation from Glenbrook North. (I abandoned the plan since my principal was retiring, and didn't want to risk spoiling his memory of his last commencement.)
On the chance that, someday soon, students at Poway High School learn to use Google and find my journal, do not get any ideas. I control the football stadium PA system, I can disable it without needing to enter the press box, and I never miss graduation. So there.