Under the baton of Keith Lockhart, the Boston Pops and Tanglewood Festival Chorus present “Christmas Canticles” and the “Hallelujah Chorus” from Handel’s Messiah. Country artist Sara Evans delivers songs from her 2014 holiday album “At Christmas,” while actor Robert Morse, known for “Mad Men,” narrates “Twas the Night Before Christmas” with musical backing. This event takes place at Symphony Hall in Boston.