CHARLES CITY — Trinity United Methodist Church will host the first concert of Cedar Valley Chamber Music’s “Shall We Dance” series at 7 p.m. Saturday, July 15.  Admission is free. The program for the “Dancing Czech to Czech” concert will be: Suk: String Quartet Movement (1915) Schulhoff: Concertino (1925) Dvorak: String Sextet, Op. 48 (1878)…