Summer opportunities for Latin in New England include:
CANE Summer Institute (July 16-21 at Dartmouth College) http://caneweb.org/CANEwp/?page_id=165 Unfortunately, the CANE Summer Institute has been canceled because of low enrollment.
Let’s Learn Latin (July 30-31 at the Roxbury Latin School; register by June 15). http://ascaniusyci.org/teachers/LLL-Boston.html
(Edited June 26, 2012 to update CANE Summer Institute Information.)