I'm pretty sure the meeting is actually on Tuesday Nov 13 (still at 7 at Tent City). I am on the Greater Boston GRP email lists. An agenda was sent out for the meeting this Tuesday which is the regular day (2nd Tuesday of each month).
The Green-Rainbow Party is the Massachusetts affiliate of the Green Party of the United States (MA political designation "J"). It was founded in 2002 through the union of the Massachusetts Green Party and the Rainbow Coalition Party.