Office for the Liturgical Celebrations of the Supreme Pontiff

The Office for the Liturgical Celebrations of the Supreme Pontiff (Latin: Officium de Liturgicis Celebrationibus Summi Pontificis, Italian: Ufficio delle Celebrazioni Liturgiche del Sommo Pontefice) is the section of the Roman Curia responsible for preparing whatever is needed for the liturgical and other sacred celebrations in the Vatican at which the Pope, or – in his name and by his mandate – a Cardinal or a Prelate presides, participates or assists, and for supervising them according to the current prescriptions of liturgical law. It also arranges everything necessary or useful for their dignified celebration and for the active participation of the faithful.

Source: Wikipedia — Office for the Liturgical Celebrations of the Supreme Pontiff (CC BY-SA 4.0)