Vatican website translation:
45. For the same reason every diocese is to have a commission on the sacred liturgy under the direction of the bishop, for promoting the liturgical apostolate.
Sometimes it may be expedient that several dioceses should form between them one single commission which will be able to promote the liturgy by common consultation.
Latin text:
45. Eadem ratione, in singulis dioecesibus Commissio de sacra Liturgia habeatur, ad actionem liturgicam, moderante Episcopo, promovendam.
Opportunum aliquando evadere potest ut plures dioeceses unam Commissionem constituant, quae, collatis consiliis, rem liturgicam provehat.
Slavishly literal translation:
By the same reason, in individual dioceses a Commission concerning sacred Liturgy may be established, with the Bishop directing, for promoting liturgical action.
It could sometimes be opportune that multiple dioceses would constitute a single Commission, which, with recommendations having been gathered [from the dioceses], might carry forward the liturgical issue.
Following upon art. 44โs declaration that territorial bishopโs conferences should establish both a Liturgical Commission and an Institute of Pastoral Liturgy, art. 45 is an exercise in subsidiarity, recommending that a similar Liturgical Commission be established in each diocese or, if need be, in groups of dioceses smaller than the territorial grouping. No particular duties are entrusted to these Commissions except that of promoting the liturgical apostolate. We will see that art. 46 will make a further structural recommendation concerning the promotion of liturgical life in a diocese.
Pray Tell readers may wish to report on how well dioceses or groups of dioceses have fulfilled this directive of SC in the past fifty years. For example: Is there a functioning Diocesan Liturgy Commission? What is its relationship to the Bishop (Ordinary)? What is its membership? How are its members chosen and what constituencies do they represent? How often does it meet? What topics does it discuss? What is its decision-making competence? How does it relate to the Diocesan Office of Worship (or its equivalent) if such a structure exists? How does it promote liturgical life in the diocese? What successes has it achieved and what challenges has it faced?
In situations where neither Liturgy Commission nor Office of Worship exist in a given diocese, Pray Tell readers might wish to discuss how this directive of SC might be fulfilled.

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