WATERTOWN — One way to measure greatness is to test how well an artist’s work accommodates changing social circumstances, how it stands up in a new context. Think, for example, of the Shakespeare productions that have unfolded in other times and places than the playwright originally intended, or, indeed, could ever have envisioned.

Now, nearly a decade after Massachusetts led the way nationally by legalizing same-sex marriage, the New Repertory Theatre is staging a production of Stephen Sondheim’s “Marry Me a Little’’ that broadens its scope to include gay relationships.