The Blessed Sacrament Chapel is prepared for Adoration. This commemorates the disciples staying with Jesus during His agony on the Mount of Olives before his betrayal by Judas
Holy Thursday commemorates the institution of the Eucharist by Christ himself at the Last Supper and is the oldest observance of Holy Week (the last week of Jesus Christ's mortal life)
In the evening because Passover began at sundown. At the Last Supper, Jesus is the self-offered Passover Victim.
Withdrawing of lights, and use of candles may be considered a desire to express the sense of the Church's bereavement during the time of Christ's Passion and Burial
Msgr James T Logan, Bishop John T Steinbock and Fr Eric Swearingen
Washing of the feet just as Jesus washed the feet of His disciples shows humility of service and the need for cleansing with water (a symbol of baptism)
Candles are distributed for the outdoor procession
By His authority and command every ordained priest presents this same sacrifice in exactly the same way