[Update: Papal message on the matter]
From semi-official French Catholic daily La Croix (excerpt on the Traditional Mass only):
Geopolitics, liturgy, education, and the martyrs of Algeria on the agenda of the bishops' Plenary Assembly in Lourdes
By Céline Hoyeau
Published March 24, 2026, at 6:50 AM
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Liturgy on the assembly's agenda
Also on the agenda of this assembly: liturgy — which is among the two topics on the agenda of the next consistory in Rome, in June. At issue, notably, is what action to take following the motu proprio Traditionis Custodes published by Pope Francis in 2021, which had drastically restricted the possibility of celebrating the Tridentine Mass. Will these restrictions need to be maintained, or should the permission granted by Benedict XVI to the traditionalist world be restored, especially given that, beyond the success of the Pentecost pilgrimage to Chartres, other regional "traditionalist" pilgrimages have emerged in France?
"It has been a long time since this topic, which is not without causing tensions, has been addressed at the assembly. The bishops, whose sensibilities on the subject vary widely, will share how things are going in their dioceses and what questions are arising. This should enable Cardinal Jean-Marc Aveline to bring a well-informed contribution to the June consistory," notes an internal source.
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[source, in French]