Francis appointed a four-member organising committee headed by the Vatican's top sex crimes investigator, Maltese Archbishop Charles Scicluna, Chicago Cardinal Blase Cupich, Mumbai Cardinal Osvald Gracias and the Rev. Hans Zollner, a member of Francis' sex abuse advisory commission.
They had urged participants to meet with victims before they came to Rome, to both familiarise themselves with victims' pain and trauma and debunk the widely held idea that clergy sex abuse only happens in some parts of the world, Cupich told AP last week.
Survivors will be represented at the summit itself via some video testimony, he said.
Cruz said the key message for the bishops to take away from the summit is that they must enforce true "zero tolerance" or face the consequences.
"There are enforceable laws in the church to punish not only those who commit the abuse but those who cover it up," he told AP. "No matter what rank they have in the church, they should pay."
- AP