Tickets will go on sale Friday for the 19th Hamptons International Film Festival and once again film aficionados will wonder how and where they will ever fit in everything they want to see, as the screenings and events will expand from their base in East Hampton to include almost every village or hamlet that has a theater from Montauk to Westhampton, including Sag Harbor and Southampton, and even Robert Wilson’s Watermill Center. The festival runs Oct. 13 to 17.