There is an import of the new Massachusetts-wide MassGIS building layer underway. The work is done semi-automatically town by town, to verify data integrity and avoid conflicts with existing contributions. We could walk through how to take-on a town and help importing the data into OSM if people are interested.
More info: http://wiki.openstreetmap.org/wiki/MassGIS_Buildings_Import
Update: We're meeting in the 3rd Floor Conference Room.
Doors open at 6pm, please check-in at the reception downstairs.