A few black-and-white photos of Locarno’s first editions hung from the walls of the hotel that hosted me there for five days this month. Long before it began to stretch across several venues around town—none more iconic than the Piazza Grande, which every night turns into an 8,000-seat open air theater—the fest originally took place in the garden of Locarno’s Grand Hotel. This is where those pictures were taken. It is August 22, 1946, and they’re watching Giacomo Gentilomo’s My Su...