Just in case some still profess that everything in DC happened randomly without planning, it is a false assumption. Please read this document from the Vatican.
OFFICE OF THE LITURGICAL CELEBRATIONS OF THE SUPREME PONTIFF
- General preparation. Very often for special occasions such as the opening of a Synod, e.g., the Synod for Africa, an ecumenical liturgy, one of the many Holy Year celebrations, or a Papal Visit, preparation begins with a detailed plan, drafted with the help of qualified experts. This is followed by an on-the-spot investigation of the location, to identify the place of celebration, the positioning of fixed elements, the places for the ministers and the choice of local persons to carry out the various ministries and tasks, etc.
Moreover, the booklet for the use of the faithful must be put together, including, in the case of a Papal Visit a special missal for the Pope and concelebrants which harmonizes the different elements of the celebration (word, prayers, invitations, songs, ritual gestures),
in order to ensure, as far as possible, that nothing is left to last-minute improvisation.
For each celebration the Office prepares a service booklet, or Præparanda, with the list of things to be done, the names of the persons involved in the celebration, the task assigned to each master of ceremonies, a diagram of the location showing the site and its elements and positions.
Every celebration requires a rehearsal, usually the day before, to make sure that everything is clear and to solve any potential problems.
- PIERO MARINI
Titular Archbishop of Martirano
**Master of Papal Liturgical Celebrations **