VATICAN CITY (CNS) -- The Vatican is expecting some 70,000 children between the ages of 5 and 12 and their chaperones to fill Rome's Olympic Stadium for the opening events of the first World Children's Day May 25 and to join Pope Francis for Mass in St. Peter's Square the next morning. Franciscan Father Enzo Fortunato, coordinator of the event, told reporters May 16 that, given school schedules and travel logistics, only about 10% of the participants will be children from outside of Italy. But, he said, 101 nations will be represented.