This reminds me of [0], basically just inviting the most interesting people I know (also transitively the most interesting people they know), and just getting to meet people. I would really like to do this, but half the most interesting people I know are PhD professors I rant with because I'm next to them in a lab. Maybe once my network gets bigger. But I would still like to know more about how you do this, as other people doing this accidentally made me some good friendships, and I'd like to repay this favor to others

[0] https://takes.jamesomalley.co.uk/p/this-might-be-oversharing

How I do it is context-specific. I used to live in a place where it's undoable and I was very lonely there. I moved to a place where people are much more open to it culturally and there's enough population to +/- bring in a constant flow of 4:1 regulars to newbies.

I advertise on local meetup platforms and in local social media. And I go to so many meetups myself that when people ask me what my hobbies are and I tell them, they get curious and self-invite.