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.