I would approach it in the same way that we approach Christmas and the 4th Sunday of Advent the week prior.
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.
I was unaware of that precedent! The more you know....
Q. Which Mass should be celebrated on the evening of December 31, keeping in mind that the celebration of solemnities normally begins with the evening of the preceding day?
A. In answering this and similar questions, one should first consider the following principle established by the 1969 General Norms for the Liturgical Year and Calendar: “If several celebrations fall on the same day, the one that holds the highest rank according to the preceding Table of Liturgical Days is observed” (60).
Taking this into account, it might seem at first that evening Masses on December 31, 2017 should celebrate the Solemnity of Mary, the Holy Mother of God, considering that Solemnities of the Blessed Virgin Mary appear higher than Feasts of the Lord on the Table of Liturgical Days. However, another lesser-known norm promulgated by the Congregation for Divine Worship must also be borne in mind. In 1984, the Congregation offered the following additional guidance on this issue: “In the celebration of Mass, precedence is always to be given (“præcedentia semper danda est”) to the feast of precept [holy day of obligation], regardless of the ranks of the two consecutive feasts....” (Congregation for Divine Worship: Notitiæ 20 [1984] 603).
This rule appears to have been established as a way of serving the pastoral needs of the faithful who attend evening Masses and expect to celebrate the Sunday liturgy.
To return to the particular question at hand, inasmuch as the Solemnity of Mary, the Holy Mother of God, falls on a Monday in 2018 and is, therefore, not a holy day of obligation, evening Masses on December 31, 2017 should celebrate the Feast of the Holy Family. This is due to the fact that the solemnity of Sunday is always observed as a holy day of obligation, while the Solemnity of Mary, the Holy Mother of God, is not in this case.
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