I would presume you could sing the Gregorian propers for the feast of the Holy Family.
Or you could just do a votive Mass of the Holy Family instead, using all the texts from the feast.
^even in the NO can you have a votive Mass of the Lord like that??
GIRM 375. Votive Masses of the mysteries of the Lord or in honour of the Blessed Virgin Mary or of the Angels or of any given Saint or of all the Saints may be said in response to the devotion of the faithful on weekdays in Ordinary Time, even if an optional memorial occurs. However, it is not permitted to celebrate as Votive Masses those that refer to mysteries related to events in the life of the Lord or of the Blessed Virgin Mary, with the exception of the Mass of the Immaculate Conception, since their celebration is an integral part of the course of the liturgical year.
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