From Father LaLonde's Facebook page:

To those who will attend my first Masses in Louisiana (6/12, 6/13), Florida (6/17), and Massachusetts (6/23, 6/24): the plenary indulgence for a priest's first Mass is extended to you, with the usual conditions being met, so that you may grow in the supernatural virtues, especially faith, hope, and love, and so that your communion with the Holy Father and the whole Catholic Church may be strengthened.