Cooperatives of all kind. Housing. Work. Canteens.
Warm and welcoming places that invite all to step in from the cold and stay awhile.
Housing coops and canteens exist but are not common.
Worker coops on the other hand...
I sincerely believe that a well-organized tech worker coop would eat the world. The incentives are fundamentally misaligned for the average worker in the modern corporation. I'm well aware that I'm getting taking advantage of everyday when I show up to work, and that sets a pretty low upper bound on the amount of fucks I give about someone else's corporation.
How about a place where you can go to get food and socialize with people without being required to buy something? A bar, but for those who don't want to drink. A coffee shop for those who don't want to pay 3 dollars for burned coffee. A library where you're allowed to eat. A park where it's okay to hang out and talk to strangers even if you're an adult and don't have a kid or dog with you.
Maybe you haven’t been to a bar that has kicked you out for not buying something, but you have certainly been to a bar that wishes you weren’t there not buying stuff. If you think you haven’t, well...
Hobbies are a good way to meet people. Volunteer work is better.