The Ponca City Art Association will hold a live auction of more than 100 pieces from its fine art collection Saturday, Aug. 24. An auction preview will be Thursday from 5 to 7 p.m. Artwork up for sale includes oil paintings, etchings, numbered prints, sculptures, pottery and other medial. The sale will be both through silent and live auctions, as well as by private treaty. The sale, to be held…