I’ve done some of this in the relatively small place where I live, and done some of it online.
In person, I totally agree about organising stuff. A couple of friends organised a tiny exhibition recently and I played some music and put my tapes out for sale, while visual artists had things in the space. All the people (exhibiting stuff, having a look, or just hanging out with their friends) chatted freely with each other and although it was tiny, it was a really nice sense of connection. It was just like a relaxed house party with a point of focus.
Organising online, a la this latest RHCP - wait, LCRP - can be great. I organised a “double helix” parallel remix chain thing in maybe 2000 and there’s people involved with that I’m still in touch with now.
A strangely basic tip for online stuff is if I agree to a one-off collaboration or whatever, I do try to share a bit of basic stuff about my life. Not like “here’s my life history”, but just some of the same kind of things you might discuss in person if starting a new project and making small talk while having a break from talking about the project. Where you live, what you do with your days outside music, how long you’ve been making music for, who you live with maybe, etc. Just whatever comes up naturally - but sometimes you have to kick it off a bit consciously. I’ve got some musical connections I’ve stayed in touch with online for over a decade. Three of us are just trying out a long-distance collaboration after all that time.