Simple Facts about WYD. Can non-catholics join?

World Youth Day is the largest youth event in the world and will be held in
Sydney 15-20 July 2008 World Youth Day is the Catholic Church's Day for youth and with youth World Youth Day gathers young people from around the world to build bridges
of friendship and hope between continents, peoples and cultures

Inspired by great gatherings of the world’s youth for Palm Sunday events in Rome, Pope John Paul II established World Youth Day as an annual event and to reach out to the next generation of Catholics

World Youth Day has been held since 1986, when the first event was held in Rome. It is celebrated every year in Rome and at a Diocesan level and a major
international celebration is held every 2-3 years in a different host city.

Sydney will host the 23 World Youth Day and the 10th World Youth Day
outside Rome

World Youth Day is an invitation from the Holy Father to all the youth of the world without any kind of discrimination. While World Youth Day celebrates young people’s Catholic faith, its message is relevant for all people. The event welcomes people of all backgrounds wishing to join the experience

World Youth Day has previously been held in Rome, Paris, Cologne (Germany), Czestochowa (Poland), Denver (USA), Toronto (Canada), Buenos Aires (Argentina), Manila (The Philippines) and Santiago de Compostela (Spain)

Sydney’s role as host of WYD08 started with the Handover of the World Youth Day Cross and Icon of Our Lady on Sunday 9 April 2006 following the traditional Palm Sunday Mass in St Peter’s Square

Note: Yes, there is no discrimination, this is not a "catholic event only", its a "youth event". So just like the Vatican 2, if you're not Catholic, you're welcome!