Thousands of young Catholics began assembling Saturday for an evening prayer vigil led by Pope Leo XIV, the culmination of a week-long pilgrimage and a key event in the Jubilee holy year that is expected to draw up to a million people.

Up to a million young Catholic believers are expected Saturday for a nighttime vigil led by Pope Leo XIV, the culmination of a weeklong pilgrimage, a key event in the Jubilee holy year. The “Jubilee of Youth” — when the Vatican invites Catholics ages 18 to 35 to the seat of the global Church’s power — has seen thousands of young pilgrims from around the world flood Rome this week.