A lot of great orchestra repertoire requires two harps, (i.e. Debussy: La Mer, Berlioz: Symphonie fantastique, Ravel: La Valse) so make sure that you only request the ones that only need one harp. You also may have to keep in mind how advanced your orchestra is. Ravel’s Mother Goose Suite has a lovely harp part. Respighi’s Fountains of Rome and Pines of Rome are fun to play. Debussy’s Petite Suite has a lovely, single harp part, and The Prelude to Afternoon of a Faun can be done easily combining the two parts. Stravinsky’s Firebird Suite has one harp part, and it is really gorgeous.