Cantus and Theater Latte Da If you like Christmas songs delivered in a traditional format, Cantus‘ “All is Calm” probably isn’t the show for you. If you like them offered as part of a dramatic story, with plotlines lifted from history, perhaps it’s exactly what you’re after. The show “All is Calm: The Christmas Truce of 1914″ comes to the Walton Arts Center on Thursday (Nov. 29).