Metro won't be an issue if it's over in 4...
Game 1 could be a problem: starts at 19.30 and the last northbound Green line train leaves at 00.52, but in reality people will have to leave earlier than that to be assured of catching connecting trains on the other lines - and also avoiding the inevitable crowds from this sold-out fixture. (Don't forget that in general, post-season matches last quite a bit longer than regular-season ones because of the added commercials and pre-match pomp-and-circimstance.)