The first WPPB Harvest Costume Ball and Art Auction will be held Saturday from 8 to 11 p.m. at the South Street Gallery in Greenport. Organized by Joyce deCordova, Alex Ferrone, and Amy Worth, the event will benefit 88.3 FM Peconic Public Broadcasting. The evening will include music from a D.J., dancing, hors d’oeuvres from Noah’s Restaurant, wines from Lieb Cellars, and a silent art auction with works by more than 40 artists selected by Arlene Bujese, curator at the Southampton Cultural Center.