This is from the Vatican Information Service:
Vatican City, 21 March 2013 (VIS) – On Holy Thursday, 28 March, the Holy Father Francis will celebrate the Chrism Mass in St. Peter's Basilica in the morning and then, at 5:30pm in the afternoon, will go to celebrate the Mass of the Lord's Supper at the Casal del Marmo youth detention centre instead of the Basilica of St. John Lateran, where it had been traditionally held in past years.
[Blessed Pope John Paul II's Apostolic Constitution Universi Dominici Gregis orders that "After the solemn ceremony of the inauguration of the Pontificate and within an appropriate time, the Pope will take possession of the Patriarchal Archbasilica of the Lateran, according to the prescribed ritual." On March, 19, the Solemnity of St. Joseph, Husband of the Blessed Virgin Mary, Pope Francis celebrated the Mass commemorating the inauguration of his pontificate. The Mass of Installation -- or, Santa Messa Per L'Inizio Del Ministero Petrino Del Vescovo Di Roma -- was celebrated outdoors at St. Peter's Basilica in the Vatican. The Pope will take possession of St. John Lateran sometime after Easter in April.]
The Mass of the Lord's Supper is characterized by the announcement of the commandment of love and the gesture of washing the feet. In his ministry as Archbishop of Buenos Aires, Cardinal Bergoglio used to celebrate the Mass in a prison or hospital or hospice for the poor and marginalized. With this celebration at Casal del Marmo, Pope Francis will continue his custom, which is characterized by its humble context.
[The Mass of the Lord's Supper commemorates the Institution of the Church, the Priesthood, and the Eucharist. Its liturgical ritual includes the washing of the feet -- or, mandatum -- and the transfer of the Eucharist. Although an option and not a strict requirement of the Mass, the mandatum is the most characteristic element of the Holy Thursday liturgy. About power, Pope Francis spoke these words:
The other Holy Week celebrations will be held according to tradition, as established in a notification by the Office of Liturgical Celebrations.
Pope Benedict XVI also visited the Casal del Marmo youth detention centre, on 18 March in 2007, to celebrate Mass in the Chapel of the Merciful Father.
