Depending on the countries, Maundy Thursday is also known as Holy Thursday, Covenant Thursday, Sheer Thursday and Thursday of Mysteries.
The date is always between March 19 and April 22, because some countries use the Gregorian calendar and others, the Julian calendar.
Maundy Thursday starts the religious days which commemorates the passion, death, and resurrection of Christ.
On Maundy Thursday, they commemorate the institution of the Eucharist, the agony and prayer of Jesus in the Garden of Olives, Judas betrayal, and the arrest of Jesus.
On Maundy Thursday, Jesus dined with his apostles following a Jewish tradition. According to the account in the Book of Exodus, they had to dine a lamb and sprinkle with its blood the entrance to the house. This is The Last Supper.
During The Last Supper, Jesus instituted the Eucharist:
“Now as they were eating, Jesus took bread, and after blessing it broke it and gave it to the disciples, and said, “Take, eat; this is my body.” And he took a cup, and when he had given thanks he gave it to them, saying, “Drink of it, all of you, for this is my blood of the covenant, which is poured out for many for the forgiveness of sins. I tell you I will not drink again of this fruit of the vine until that day when I drink it new with you in my Father’s kingdom.” Matthew 26:26-29.
And Judas Iscariot betrayed Jesus:
“Now before the Feast of the Passover, when Jesus knew that his hour had come to depart out of this world to the Father, having loved his own who were in the world, he loved them to the end. During supper, when the devil had already put it into the heart of Judas Iscariot, Simon’s son, to betray him, Jesus, knowing that the Father had given all things into his hands, and that he had come from God and was going back to God, rose from supper. He laid aside his outer garments, and taking a towel, tied it around his waist. Then he poured water into a basin and began to wash the disciples’ feet and to wipe them with the towel that was wrapped around him.” John 13:1-38.
But to me, the most important moment is when Jesus says:
“A new commandment I give to you, that you love one another: just as I have loved you, you also are to love one another.” John 13:34.
Definitely, I think they commemorate peace and love.