Given the limited capacity of the Papal Basilica of St. Peter's, mere registration for the event, which is necessary for organizational purposes, does not grant admission, which will be allowed only to those in possession of the special free ticket issued by the Prefecture of the Papal Household through the following link:
https://www.vatican.va/various/prefettura/it/biglietti_it.html
The faithful not in possession of such a ticket will still be allowed to follow the Ceremony from the big screens positioned in St. Peter's Square, without the need for a ticket.
On the other hand, Bishops and Priests who wish to concelebrate, and Deacons who wish to participate, will have to make reservations at the Office of Liturgical Celebrations of the Supreme Pontiff through the following link:
https://biglietti.liturgiepontificie.va/