PRESS PHOTO BY LORI PATRICKDaryl Hall, left, and John Oates, right, concluded Fairgrounds Grandstand concerts Sept. 1 at the 167th Great Allentown Fair before a near-capacity crowd. The formerly Philadelphia-based duo, backed by a six-piece band, opened the show with “Maneater,” played numerous other hit songs, as well as some deep catalogue tunes, including “Adult Education,” written by Hall as