From a priest reader:
Attended [Mount St. Mary Seminary] open house festivities this evening, including Service of Lessons and Carols, at which Mount rector Msgr. Rohlfs announced the planned celebration of EF Mass tomorrow at 4:15 pm at the Chapel of the Immaculate Conception, Mount Saint Mary’s College, Emmitsburg, MD, for the first time in about 50 years. A choir will travel from Washington, DC, to assist at the Mass.
And from a seminarian:
This is the required Mass for the seminarians, and will be celebrated by Monsignor Pope from the Archdiocese of Washington. I believe it to be the first solemn Mass in the Extraordinary Form there in many years, and the first in as many that the seminarians are required to attend. This is their Mass, so I assume they will be singing the Mass and fulfilling all of the offices.