I donāt know how to explain it exactly what is WYD.

. Try to ask others

.
World Youth Day is a 2week long Camp for Young Catholics 13-30year olds who attend catechism, mass, lectures, debates etc. They had exhibitions of articles from the Vatican, halls of stands full of everything Catholic.
It was started by PopeJPII and is held every 3years I think. This year Brazil is the host.
Catholic Youth from all over the world attend and are billeted by families in the local area; camp in halls of local Catholic schools, Catholic universities, hotels, backpackers etc. It culminates in a Papal Mass.
I was lucky enough to attend WYD in Sydney 2008 and it was AWESOMEā¦LIFE CHANGINGā¦
I met Catholics from China, Iraq, Iran, Pakistan, India, Russia, Brazil, Denmark, England, all over the world.
There was also non-Catholics who attended. Hillsong choir sang one night, all sorts of Catholic bands and musicians.
We had half a million attend the papal Mass. WYD in Philipines had millions attend.
Below is footage of different WYD over the years. The song is the theme song of the Sydney WYD.
youtube.com/watch?v=iwoEU2uVDfw
Pope arriving at final Mass WYD Sydney
Hillsong Choir at WYD
youtube.com/watch?v=Sah05PGoc4o