I disagree with meetups and hackthons being a low signal to find like minded individuals. If spending a weekend hacking on a project at a hackathon or a few hours after work attending a meetup does not foster a community of well intentioned developers i don't know what other avenue OP will meet people. But with any open events there is the inventible freeloaders.
Meet-ups/Hackathons/Concerts/Sports/Bars/Social-clubs