Mark Dvorak, a nationally known folk singer and songwriter, will appear in The Back Room of the Barton County Arts Center, Forest and Main, Great Bend at 2 p.m., Sunday. Admission is $10 and, since seating is limited, advance reservations or tickets are encouraged. Tickets may be purchased weekday afternoons at the Arts Center or seats may be reserved by e-mail through tickets@bartonarts.org or by calling 620-792-3097.