ADVERTISEMENT Tens of thousands of young Catholics flocked to St Peter's Square on Tuesday to kick off the Youth Jubilee, for which Pope Leo XIV held a welcome mass. Between the 28th July and the 3rd of August, the Vatican and Rome will host a series of events dedicated to young Catholics from at least 146 countries. 500,000 are expected to take part. It will culminate in a mass on the first Sunday of August at Rome's Tor Vergata. The Youth Jubilee will incorporate World Youth Day this year, as