Honestly, I think Search is the best central place for this, precisely for the reasons you mention of fragmentation. Aside from slack and non-search-visible soc

Honestly, I think Search is the best central place for this, precisely for the reasons you mention of fragmentation. Aside from slack and non-search-visible social media, a little bit of SEO juice and "related page" style links on e.g. Twitter go a long way to quickly find all sorts of groups & meetups. I've hosted meetups with Meetup for a while, but the platform always felt ridiculously expensive as an organiser for what amounted to a 2005-style "message members" form (the member management portion of the site is still ancient) and having publicly visible events. There are far cheaper ways to do that, and for discovery I'm happy to focus on organic growth via members instead of Meetup's discover page.