From the Vocation Office for the Diocesan Priesthood:
"As we anticipate the celebration of the 57th World Day of Prayer for Vocations, we invite you to pray with us for increased grace to respond to God’s call to the priesthood and religious life throughout the world, but especially in the Archdiocese of Philadelphia.
...
To celebrate this World Day of Prayer for Vocations, we invite you to join the seminarians from St. Charles Borromeo Seminary in
praying a Novena for Vocationsbetween April 25 and May 3. The seminarians have videotaped their daily reflection/prayers and each day of the Novena the videos will be uploaded to our website at
heedthecall.org/novena and our Facebook page at
facebook.com/phillypriest."
Note: You can pray this novena at any time on each of these days - whenever works best with your schedule!