394. Each diocese should have its own Calendar and Proper of Masses. For its part, the Conference of Bishops should draw up a proper Calendar for the nation or, together with other Conferences, a Calendar for a wider territory, to be approved by the Apostolic See.[Cf. Universal Norms on the Liturgical Year and the Calendar 48-51; Calendaria Particularia 4, 8]
In carrying out this task, to the greatest extent possible the Lord’s Day is to be preserved and safeguarded, as the primordial feast day, and hence other celebrations, unless they are truly of the greatest importance, should not have precedence over it.[Cf. Sacrosanctum Concilium 106] Care should likewise be taken that the liturgical year as revised by decree of the Second Vatican Council not be obscured by secondary elements.
The two observances I know that could be inserted into an ordinary time Sunday are the parish patronal feast and the dedication anniversary (recommendation is for the last Sunday in October for an unfortunately-placed feast). The diocese’s patron and cathedral dedication are also important, but usually not celebrated in any way outside the cathedral parish.
In the drawing up of the Calendar of a nation, the Rogation Days and Ember Days should be indicated (cf. no. 373), as well as the forms and texts for their celebration,[Cf. Universal Norms on the Liturgical Year and the Calendar 48-51; Calendaria Particularia 38] and other special measures should also be kept in mind.
It is appropriate that in publishing the Missal, celebrations proper to an entire nation or territory be inserted at the proper place among the celebrations of the General Calendar, while those proper to a region or diocese should have a place in a special appendix.