How many people went to World Youth Day?

Answer 1

Here are some numbers from Wikipedia:

At WYD 1995, 5 million youths gathered at Luneta Park in Manila, Philippines, an event recognized as the largest crowd ever by the Guinness World Records. In an initial comment immediately following the event, Cardinal Angelo Amato, Prefect of the Congregation for the Causes of Saints, stated that over 4 million people had participated.

2008 The week saw pilgrims from all continents participate in the Days in the Diocese program hosted by Catholic dioceses throughout Australia and New Zealand. Pope Benedict XVI arrived in Sydney on Sunday 13 July

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2008 at Richmond Air Force Base. Cardinal Pell celebrated the Opening Mass at Barangaroo (East Darling Harbour) with other activities including the re-enactment of Christ's passion during the stations of the Cross and the pope's boat cruise through Sydney Harbour. Pilgrims participated in a variety of youth festivities including visits to St Mary's Cathedral, daily Catechesis and Mass led by bishops from all around the world, concerts, visits to the tomb of Saint Mary MacKillop, the Vocations Expo at Darling Harbour, received the Sacrament of Reconciliation and praying before the Blessed Sacrament during Adoration. The Mass and concert at Barangaroo saw an estimated crowd of 150,000.

The event attracted 250,000 foreign visiting pilgrims to Sydney, with an estimated 400,000 pilgrims attending Holy Mass celebrated by Pope Benedict XVI on 20 July.

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2011 An estimated 2,000,000 people attended an all-night vigil to complete the week, more than expected.