35 In order that the celebrations attending this Centenary should turn out to be both splendid and fruitful, Venerable Brothers, it would be well that there should be supplied to your flocks all those pious helps which will lead them to honor, with the veneration which is due him, this great light of the Church. May they, by his intercession, their souls purified from the stain of sin and fed at the table of the Eucharist, be led gently but forcefully to the acquiring of holiness, and that in a very short time. See to it, therefore, that in your episcopal cities and in every parish of your dioceses that some time during the course of this year, up to December twenty-eighth inclusive, a triduum or a novena be held, during which sermons should be preached, for it is all-important that the people be well instructed in those truths which, under the guidance of St. Francis, cannot but raise the level of their spiritual lives. We leave it to your zeal to commemorate in any other way you think best the good works of this saintly bishop.
Source: Rerum Omnium Perturbationem (Vatican.va)