Iowa’s only professional musical theatre Way Off Broadway in Fairfield is showing their third and final musical of the summer. “Big River” is the musical adaptation of Mark Twain’s 1884 novel The Adventures of Huckleberry Finn.  The musical has three performances left, tomorrow through Sunday.  Tomorrow through Saturday’s performances begin at 7pm, and Sunday’s matinee begins at 2pm.  For tickets and more information on “Big River,” visit WOBroadway.com or fairfieldacc.com.