Let me point out that the three days of the Paschal Triduum are NOT Thursday, Friday, and Saturday. Rather, they are Friday, Saturday, and Sunday, if you are considering the biblical meaning of a day beginning at night.
The Mass of the Lord's Supper on Holy Thursday, the Passion of Friday, and the Easter Vigil, take the place of Night Prayer. This means that the Easter Vigil is celebrated at the right time, so according to Br. Charles, contrary to what some think, that there is such a thing as Evening Prayer I of Easter Sunday, even if you do participate in the Easter Vigil.