Oddly enough, I've been to every HS reunion since our 5th (ever 5 years), including our 40th this past fall (was delayed 2 years). I say oddly because I rarely see any of my friends from HS (Wash Twp in Gloucester County), since I moved up to this area to go to RU in 1980, but for some reason I find the reunions to be fascinating, perhaps because most of the people who were kind of dicks in HS don't go to the reunions, which are run by a few of the very active girls from HS who were pretty cool (not snotty). We generally get about 80-90 from a class of 400, which is a pretty high % from talking to friends from other schools. Also, since the 20th, I've been DJ-ing the reunions, since it saves the class a decent chunk of change that we put towards good food and drinks and folks obviously seem to like what I play (the dance floor is pretty full for the last 2 hours of the night).
I also go to the Melody Bar Reunions every year (now twice a year) and they've been going on since 2007 and are a blast. I have much closer friends that go to those than the HS reunions, including several who we've been close to since the mid/late 80s. And I get a group of RU Chem E's from the mid/late 80s together about once a year. I guess I like reunions, lol. Or old friends, since our poker group has been playing poker once a month for close to 40 years without missing more than a handful of games (twice a month now - once in person and once on-line, since one of our guys created a fantastic on-line poker game during COVID).