Where are these options for subsitution stated? Our diocesan Ordo lists the Masses and says 'each proper' at Christmas, and simply omits the Pentecost Vigil.
This for the shepherd, not the sheep; The pastoral reason is avoiding preparing more than one sermon.
UNIVERSAL NORMS ON THE LITURGICAL YEAR AND THE CALENDAR
§11. Solemnities are counted among the most important days, whose celebration begins with First Vespers (Evening Prayer I) on the preceding day. Some Solemnities are also endowed with their own Vigil Mass, which is to be used on the evening of the preceding day, if an evening Mass is celebrated.
What authority does that little Ordo book have ?
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