Well, though I've had no luck with Meetup.com, it isn't stopping others from trying to organize something for Universalist Christians -- to "Meet other local Universalists or people interested in Universalism, the belief in the eventual salvation of all creation." (And before you get your pants in a knot about the "exclusivity" of such a move, do recall that the "Unitarian meetup" was created to gather Unitarian Universalists.)
It is small so far, and seems to be spearheaded by the folks who read UniversalistChristians.net, with undersized groups in Indianapolis, Richmond Va., Montgomery, Milwaukee, Concord Ca., and Florence, S.C.
These groups need promotion to help them reach critical mass. Do see.