Anniversary Dinner Friday Night
Since Friday is supposed to be a snowy evening, I'll second l'Espalier. You can walk across Dalton Street to the Sheraton and stroll through the Prudential Center to the restaurant. Ask for directions to reach the Mandarin Hotel from inside the center and walk through their second floor lobby to L'Espalier.
You could start out early and go downstairs to have a drink at the M-Lounge in the Mandarin on the way.