It’s a holiday themed show. A preview of the making of The Boston Ballet’s, “The Gift,” their streaming project, Handel + Haydn Society’s free performance and a preview of Handel’s “Messiah” in collaboration with GBH, which airs on Sunday, entitled, “Messiah for Our Time.” Concertmaster Aisslinn Nosky discusses the historic and uplifting piece, plus Boston Baroque presents, “A Baroque Holiday”