The Indigo Girls, Amy Ray and Emily Saliers, will bring their contemporary folk music to Freeport Saturday, Aug. 18, as part of the L.L. Bean Summer Concert Series. The duo got its beginning at The Little 5 Points Pub in Atlanta in the 1980s. The free concert in L.L. Bean’s Discovery Park will begin at 7:30 p.m. Listeners are urged to bring a lawn chair.