This Mass is only the second Solemn Pontifical Mass to be celebrated by a Filipino bishop since September 14, 2007 (the first one had been offered by Bishop Camilo Gregorio of the Prelature of Batanes on September 14, 2008 -- see this for a report on that Mass), and the first to be offered by a Filipino Ordinary in his own diocese since 1970.
Bishop Tobias had offered Solemn Pontifical Mass for the 2003 international colloquium of the Centre International d'Etudes Liturgiques in France, and a "Low Mass with Solemnity" last year, also in the convent of the Franciscan Sisters of the Immaculate.
fonte:rorate caeli