From the Latin Liturgy Association:
"On June 15th, 2014, Trinity Sunday, Rev. Fr. Joseph Heffernan, FSSP, will celebrate a Solemn Mass at the Cathedral Basilica of Sts. Peter & Paul, at 18th and the Ben Franklin Parkway. The Mass will begin at 2:00 PM. Father Heffernan is from Philadelphia and was a parishioner at Mater Ecclesiae, of Berlin, NJ."