OK, I've now participated in several street-building projects. And they're very strange! We don't go into the new, undeveloped areas and tend patches, plant trees, etc. Nope. We all sit like zombies beneath a street vendor in an adjacent street, waiting for someone to bring the critical resource that enables all of us to hoe, or grind, or whatever, to complete the street.
The only social interactions are (1) people ask for energy from those of us who can meditatively radiated it or, (2) people ask on the help IM channel for planks, or dirt, or whatever the critically blocked resource is. This is not, in my way of thinking, very social!