世界青年日
World Youth Day began with Pope John Paul II's invitation to young people in 1984 to come to Rome for Palm Sunday. More than 300,000 turned out for the celebration. The following year – 1985 – coincided with the United Nations International Year of Youth. Then on December 20, the Pope announced the first official WYD meeting for 1986. The 2016 World Youth Day in Kraków marked thirty years since the first official World Youth Day gathering.