Pope to hold Holy Thursday mass at the Casal del Marmo juvenile hall Pope Francis celebrates his inauguration mass at at the Vatican on March 19, 2013 in Vatican City. A crowd of one million people were in St Peter's Square and the surrounding streets for the mass. Latin America's first pope was joined by world leaders and now leads and estimated 1.3 billion Catholics. VATICAN CITY, March 21 (UPI) -- Pope Francis celebrates the Last Supper of Jesus Christ inside Rome's Casal del Marmo juvenile detention center, the Vatican said Thursday. The celebration, called Maundy Thursday or Holy Thursday, will take place on March 28, Italy's ANSA news agency reported. "In his ministry as archbishop of Buenos Aires, Cardinal Bergoglio [now Pope Francis] used to celebrate this mass in a prison or hospital or home for the poor," said the Vatican in a statement. With the mass inside Casal del Marmo, "Pope Francis will continue the tradition, which should be characterized by a context of simplicity." The pontiff will also commemorate Jesus Christ's Last Supper with his apostles with a mass inside St Peter's Basilica before he heads to the juvenile detention center, ANSA said.