I've only seen the posts about them on HN--see these searches for context.[1] There was a flurry of submissions announcing them around ten years ago that quickly tapered off. The original DC group looks dead, and the much-praised HNLondon dissolved as well.
Most were organized using Meetup.com, and today, the site's 'Hacker News' topic lists a number of groups around the world.[2] Also relatively recent is this 2019 submission of a list of groups that has some meta discussion.[3] Raised there is a salient question: What, really, distinguishes an HN meetup from any other tech meetup?
