I think the key is to keep things as low-effort as possible for both the organizers and the guests. One good way is to have some sort of recurring event, say mo

I think the key is to keep things as low-effort as possible for both the organizers and the guests. One good way is to have some sort of recurring event, say movie night or drinks or whatever, happen every X day, with no coordination or input needed, just show up. Another is to live close enough together that people bump into each other and just start doing things. Even the smallest amount of planning/coordinating/etc is friction, and friction will eventually stop anything. When you start to look at the bigger picture - relationships, aging, childcare, morals, help for the needy, etc - you realize you just want to reconstruct a mildly religious community from the pre-industrial age.