On Holy Thursday we commemorate the Last Supper, the remembrance of the Passover meal celebrated by Jesus and his disciples. Holy Thursday is also called Maundy Thursday. This comes from the Latin word mandatum, meaning commandment. This refers to the commandment where Jesus said to be of service to others and showed us this in His washing of the feet of his disciples. It is at the Last Supper Jesus instituted the sacraments of the Eucharist & Holy Orders. After the Last Supper Jesus went to the Garden of Gethsemane and it is here, after His Agony in the Garden, Jesus is arrested.
On Holy Thursday the Chrism Mass occurs. This is the Mass celebrated by the bishop and priests of the diocese. This shows the unity between the bishop and the priests of the diocese. The oils used during the various sacraments throughout the liturgical year are blessed during this Mass and distributed throughout the diocese.
The Mass of the Lord’s Supper, which is celebrated after sundown, occurs on Holy Thursday. It commemorates the institution of the sacrament of the Eucharist, and it ends with the removal of the Eucharist from the tabernacle in the main body of the church. The Eucharist is carried in procession to another place where it is kept overnight to be distributed during the commemoration of the Lord’s Passion on Good Friday. After the procession, the altar is stripped bare, and all bells in the church are silent until the Gloria at the Easter Vigil.
SEE: Mark 14:12-72; Matthew 26:10-75; Luke 22:7-62; John 13-18:27. (New American Bible)