(ANSA) - Milan, October 19 - The Expo Milan 2015 world's fair is set to reach 21 million visitors by its end on October 31, commissioner Giuseppe Sala said Monday. "Today we can officially communicate last week's numbers, we're around 1.1 million, and thus far 19.4 million, tending to arrive at 21 million in these last 13 days," he said. Sala added: "the month of October has been superior to all other months also in terms of content". Since the fair opened on May 1, Sala said, there have been more than 1,000 events.