One of my frustrations with the modern internet is how infrequently it leads to offline gatherings and connections these days. It used to be very normal that mailing lists, user groups, etc. would gather online, but also have a weekly/monthly meeting, conference, or post job ads/things for sale, etc. and you'd just organically end up meeting people and hanging out.
These days, the internet seems to be for people who really just want to discuss opinions endlessly and anonymously, but never do anything about it offline.
One does, very occasionally, see posts on HN about meetups, but it's rare and just one-off and ad-hoc, you'd think a big city like London, NYC, Boston, Chicago, etc. could easily sustain an ongoing weekly/monthly thing.