The school I attended in Miami has(had?)what's called the Miami Edison Over The Hill Gang. Every 2 years there'd be a big reunion for everyone who'd 'gradiated' from the school, so we'd have people from classes back to the late 40's. Bit by bit, the numbers were getting smaller each year what with people no longer able to make the trip from all over the U.S. to Miami, and also those who'd passed on. Each year 2 classes would be honored for their 50th. Last year it would have been the classes of 69 and 70. Didn't happen for some reason.

It was interesting going to my 50th(2014)and seeing who showed up and who was even slightly recognizable. Strangely-or maybe not-some of the same cliques were still acting the same way. They may have grown older, but not up. In general the band members are/were less divided.
The school's demographics changed dramatically after 1970, and those 'kids' aren't interested in keeping it going. I'll be surprised if there are any more of the "Big" reunions, just individual classes in smallish get-togethers.