If you guys feel something could be added to geekhack to help facilitate something like this, I am all ears.
Hmm, since you asked for it, the fully-blown-digital-attack solution based on itlnstln's proposal would to be include a "Do you want to meet other geekhack people in RL?" checkbox in people's profile. If you checked that box, it would give you access to a "people nearby" query (also in your profile) and then, given somewhat accurate location information in people's profiles - nothing fancy, just state/country data would suffice, I suppose -, everyone could indeed PM a bunch of people nearby who are willing to meet.
The easy (read: crap) way to generate that query would be, you only see people in the same country/state; the better way would be, you see *all* the people willing to meet, ordered by proximity to your own location, or at least the first 100 or so. This would make life a lot easier for inhabitants of countries such as Luxembourg, I suppose.
I know this would take quite a bit of custom coding, I suppose, but I guess it could work...