Here is one, if this is open to groups outside the U.S.
The Victorian Historical Boardgaming Collective.
When / where do you folks meet?
Hawthorn (Melbourne*) Library meeting rooms, the last Sunday of each month (10 am to 5 pm)
What sorts of games are you featuring regularly?
Mainly multi-player historical games and wargames. Also some 2 player wargames.
Do you have a Google calendar we can subscribe to for the master event calendar?
Not currently.
Edited to add BGG link:
https://boardgamegeek.com/guild/2228* Melbourne, Australia, that is.