VERO BEACH — Travel down the mighty Mississippi River with Huck Finn in “Big River,” the big musical about a boy and his adventure story that is a celebration of pure Americana. Based on Mark Twain’s irrepressible character Huck Finn who journeys with Jim, a slave trying to escape his way to freedom at the mouth of the Ohio River, this musical features toe tapping music in bluegrass and country styles that makes for an uplifting evening at the theatre. Riverside Theatre’s Summer Stage presentation for 2009, the show runs July 24, 25 and 31 at 7:30 p.m. and July 25, 26 and Aug. 1 at 1:30 p.m. in the Anne Morton Theatre.The Summer Stage program represents the best of the work of Riverside Children’s Theatre. The show features a youthful cast of area high school and college students, many of whom are theatre majors. They are supported by the professional staff at Riverside Theatre, mounting a show of the highest production values. Show director is Kevin Quillinan, assisted by music director Karen Wiggins and choreographer Deborah Quillinan.Summer Stage ’09 is underwritten with funding from the Richardson Family Foundation. Tickets may be purchased at the Riverside Theatre box office at (772) 231-6990 or (800) 445-6745. The Anne Morton Theatre is located at 3280 Riverside Park Drive, Vero Beach.