The Easter Vigil Mass is held and is the first official celebration of Jesus Christ's Resurrection from the dead. This night's vigil is the greatest and most holy of all solemnities in the Catholic Church. After churchgoers have filed into the church, the Easter Vigil service begins at sunset with an invitation from the priest to walk from the dark church outside to begin the Service of Light. New catechumens are welcomed into the church by receiving the sacraments of initiation.