Anna Marie de la Fuente Ivan Fund’s “Dusk Stone” (“Piedra Noche”) is bowing its trailer in Variety on the eve of its world premiere at the Venice Lido where it participates in the Venice Days (Giornate degli Autori ) sidebar.The Elle Driver international sales pick-up will also participate in the San Sebastián Film Festival’s Horizontes Latinos and at Biarritz where it opens the French festival.“Dusk Stone” turns on the mysterious disappearance of a young boy near his family’s beach house.