[Kihashi]

Most of the meetups I'm in have been going on for several years, at least.

My backpacking group is on meetup. I joined in 2016. Not sure when it was started, but it was a few years before that. Admittedly, the group existed in some form before Meetup did, but it has grown to over 2000 members on Meetup. There's a core group of about 50 or so who are very regularly active.

There's also a local hiking group, a python user group, a biking club, and a climbing club. Quite a few of these existed before meetup and will probably exist after meetup.