A former actress trying to break into directing tests her skills with a town’s annual Christmas Eve courtroom production in which the true authorship of the famous poem “A Visit from St. Nick” is debated.

When a town learns that Santa Claus has struck it off his delivery schedule due to an insulting letter, a way must be found to change his mind.

The Boston Pops and Tanglewood Festival Chorus, under the direction of Keith Lockhart, perform “Christmas Canticles”and “Hallelujah Chorus” from Handel’s Messiah; country singer Sara Evans, who performs selections from her 2014 holiday album “At Christmas”; and actor Robert Morse (“Mad Men”), who reads “Twas the Night Before Christmas” with musical accompaniment. From Symphony Hall in Boston.