Sunday, June 12, 2016 will be the 400th anniversary of the Dedication of the Church of the Blessed Trinity of Pilgrims (Santissima Trinità dei Pellegrini), the personal parish of the Priestly Fraternity of Saint Peter (FSSP) in Rome, exclusively dedicated to the Traditional Mass.
On that glorious day, at 11 am, a Pontifical Mass of the anniversary of the Dedication will be celebrated by Abp. Guido Pozzo, the secretary of the Pontifical Commission Ecclesia Dei.
(Source)