The Paschal Triduum is the most important liturgical celebration in the Catholic Church, commemorating the Passion, Death, and Resurrection of Jesus Christ. It begins with the evening Mass on Holy Thursday and concludes the evening of Easter Sunday. Key events include the Last Supper on Holy Thursday, the crucifixion and veneration of the cross on Good Friday, and the Easter Vigil liturgy heralding the Resurrection on Holy Saturday night into Easter Sunday.