During Holy Week we celebrate the Paschal Mystery - the suffering, death and resurrection of Jesus beginning with Palm Sunday and concluding with the Triduum - Holy Thursday, Good Friday, and Easter. During the Triduum we celebrate the core mystery of our Christian faith and our own participation in this mystery.
Holy Thursday - Mass of the Lord's Supper
Holy Thursday is the commemoration of the Last Supper of Jesus Christ when he established the sacrament of Holy Communion and instituted the priesthood with the words “Do this in memory of me.” Jesus celebrated the dinner as a Passover feast and redefined Himself as the spotless sacrificial lamb. Unique to Holy Thursday is the ritual reenactment of Jesus washing the feet of his disciples.
In churches all around the world, parishioners who represent various ministries will have their feet washed. At the end of the Holy Thursday liturgy, the Blessed Sacrament is processed throughout the church (sometimes it is processed outside) and is then placed in a side tabernacle where it remains for parishioners to adore.