Also check the Thrus. edition of the Boston Globe the Calendar section. They have a good listing of clubs, concerts & other folk venues.
You can also google up "music for Robin" there's another good, mostly, Celtic calendar there.
There are over 200 folk venues within 100 miles of Boston.
What's your preference?
I'm heading out the door in a few minutes & will be back on Monday. I'll check back on this thread & see how far you've gotten & will try to put in more.
Good Luck
Barry