Monday through Thursday, early evening, there is a mass in the church of Notre-Dame with a blessing especially for Pilgrims. You can check the schedule in the website of the church.
For those who depart for the Camino on Sunday and plan a stop at the Orisson Albergue or Borda we would recommend attending the mass at 8:30. It is a service totally in Euskera (Basque language) with singing and organ. We can assure you that you will not be able to understand anything, but that you will feel the fervor of those in attendance and be able join them in their prayers and the beautiful Basque hymns.