Dear Anthony,
The Liturgy celebrated on the eve before is called the Vigil Mass. Sunday is a feast
day from the calendar as is the feast day of a Saint, and others. This applies only for liturgies
and not for the beginning of a new day.
For example, Friday is Friday until 12 Midnight, however, if Saturday
is a Feast Day, you could celebrate the liturgy for the Vigil. It
is still Saturday, but the Liturgy counts for Sunday.
Fr. Nick
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