Every so often I think about creating directories of map societies or a calendar of upcoming events. That way lies madness, especially since I’d be reinventing the wheel. John Docktor already maintains calendars of exhibitions and meetings and events; sure, I’d like them to be machine-readable (i.e., have the ability to add events to your phone’s calendar), but he’s the one doing the work, so I’ll shut up now. As for map societies, Tony Campbell lists the international societies, while James Speed Hensinger maintains indexes of the local map societies.
There may be other resources out there along these lines; let me know about them and I’ll post them.