Holy Saturday (in Latin, Sabbatum Sanctum), the ‘day of the entombed Christ’, is the Lord’s day of rest, for on that day Christ’s body lay in His tomb. We recall the Apostle’s Creed, which says “He descended unto the dead.” It is a day of suspense between two worlds, that of darkness, sin and death, and that of the Resurrection and the restoration of the Light of the World. For this reason no divine services are held until the Easter Vigil begins that night. This day between Good Friday and Easter Day makes present to us the end of one world and the complete newness of the era of salvation inaugurated by the Resurrection of Christ.
Nightfall on Holy Saturday is time for joy and greatest expectation because of the beautiful liturgy of the Easter Vigil, often referred to as the Mother of all Holy Vigils, or the Great Service of Light. The Easter Vigil was restored to the liturgy in 1955, during the liturgical reform that preceded the Second Vatican Council.(Women for Faith and Family website)