Join the SCA
. Or find a local sci-fi fan group. My therapist suggested, when I was expressing similar thoughts some time ago, that we should go to swing clubs, at least the kind where there is more of a social vibe, not to swing, per se, but to meet people in a similar mind-set.
We would be doing some or all of these things (actually for us it would be returning to the SCA) if we didn't have children and had time for a social life :P.