These people in Minneapolis seem pretty cool,
The Geek Partnership Society. They run themed "nerd proms", gaming events, writer workshops, parties at cons, volunteer things, nerf wars, and organize getting authors and scientists to come visit some of the local schools. It's an idea with potential.
(Also, I just realized I have a "geekery" and a "nerdity" tag, and I think only one can survive. Now to figure out which.)