Julia Roberts, George Clooney, Emma Stone, Dwayne Johnson, Adam Sandler and Idris Elba are just some of the celebrities headlining films at this year’s Venice International Film Festival. Organizers on Tuesday unveiled the starry lineup for its 82nd edition, which kicks off a busy fall film festival season in August. Two years after launching “Poor Things” at Venice, Yorgos Lanthimos and Stone are returning with “Bugonia,” an English language remake of the South Korean sci-fi comedy “Save the Green Planet!” that is among the 21 films playing in the main competition.