For my grandfather passing away last week, it's easy to realize that was the bottom of the valley. His health had been declining for quite a while...but now he's no longer in pain and everyone is able to (slowly) begin to move upward. Of course we'll all miss him for the rest of our lives, but that valley, the worst of the worst, is now behind. We couldn't really tell where the bottom would be until we finally started moving up. I can't imagine that he'd want us to stay behind in the valley for too long.
As for the seniors tonight, I get the sense they don't know they're at a peak. So many tried leaving graduation practice early today (it's a tedious process, sure, but they'd only been there for an hour and a half) that I still don't think they appreciate this is the end of a big chapter. They were all in such a hurry to get out of the school an extra 20 minutes early that they didn't consider it's the second-to-last time they'll ever be there as students. They keep pushing forward while skipping the present, looking forward to Prom (which will be over forever at 11pm tonight) or Graduation (which will be done for good next Tuesday) or college (which seems far off but in four years it'll be gone too). I get the sense, after the lights come back on tonight, many will start to realize they're on the top peak right now. They'll be more (and better) peaks in their lives, sure, but they won't be seeing this one again. Enjoy the view while you're here.