Director Lasse Hallstrom’s “Casanova,” shot in Venice, will have its world premiere at the 62nd Venice Film Festival. Fest director Marco Muller, in his second year on the Lido, has pacted with the movie’s Italian distributors, Buena Vista Intl. and Touchstone Pictures. Heath Ledger stars as history’s most notorious seducer, who finds himself spurned by the feisty Francesca (Sienna Miller) in this romantic comedy. For the event, Hallstrom will be on the Lido with producers Mark Gordon, Betsy Beers and Leslie Holleran and actors Ledger, Miller, Jeremy Irons (who plays Bishop Pucci) and Lena Olin (Francesca’s mother).