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.

Pope Leo XIV on Tuesday received a rock star's welcome at the Vatican's festival of Catholic influencers — priests, nuns and ordinary faithful who use their social media presence to preach and teach the faith — as he urged them to ensure that human relations don’t suffer with the spread of digital ecosystems and artificial intelligence.