Back in 2007, when Blue Heron, the virtuosic and intrepid early-music chorus, put on its first Christmas concert, it was stocked with esoteric fare: 15th-century English carols, Burgundian part songs, even a few motets from Cyprus. Most of it was stuff that few if any listeners would’ve heard previously, an unusual gambit for a season in which we prize the well-known, the comfortable.

If the odds were against these adventurous programs becoming a hit, they have long since been overcome. Blue Heron’s Christmas concert, whose fare now alternates annually between France and England — this year it’s “Christmas in Medieval England” — is a recognizable element in the city’s holiday ecosphere. Three performances in Cambridge this weekend come on the heels of a brand new CD of the same name, recorded during 2013 performances.