Score a new piece at Sag Harbor’s Arts & Crafts Fair in Marine Park from June 18-19. The Southampton Garden Club hosts “A Grecian Odyssey” flower show, luncheon and lecture at the Muses on June 23. Support the Southampton Arts Center at its “Whimsy A Garden Soirée” with cocktails and swing jazz on June 25. Marine Park Drive, Sag Harbor, N.Y., 11963. 111 Saint Andrews Road, Southampton, N.Y., 11968. 25 Jobs Lane, Southampton, N.Y., 11968