Pope Francis will celebrate Mass at the Basilica of the National Shrine of the Immaculate Conception when he visits the United States in September.

The Archdiocese of Washington and Catholic University of America announced the Mass on Monday. The pope will lead the Mass from the east portico of the Basilica, looking out on the 3.6-acre outdoor space where the university holds its annual commencement ceremony.

Roberta Mayo, who works in the public affairs office at the university, said that officials have not yet decided how they will handle ticketing for the Mass.

The last time a pope visited Catholic University, when Pope Benedict XVI came to the college in 2008, the university permitted members of the public who obtained tickets in advance to attend, Mayo said.

She said that officials from the university and the diocese will make plans for the logistics of Francis’s visit in the coming weeks. The Mass is planned for Sept. 23.

Pope Francis waves to the faithful on April 15, 2014 upon his arrival on St. Peter's square at the Vatican to lead his weekly general audience. (Vincenzo Pinto/AFP/Getty Images)

The university said in a statement that during the Mass, Francis will canonize Junipero Serra, a Franciscan missionary who was largely responsible for spreading Catholicism in the American West. He founded 21 missions before his death in 1784. The pope will make him a saint at the Mass in Washington.

During Benedict’s visit in 2008, the pope also celebrated Mass at Nationals Park. Thousands of people requested tickets.

Plans for Francis’s visit also include a meeting with the president on Sept. 23 and an address to Congress on Sept. 24. He will travel to Philadelphia and New York as well.