Maundy Thursday

Maundy Thursday is the Christian feast, or holy day, falling on the Thursday before Easter. It commemorates the Last Supper of Jesus Christ with the Apostles as described in the gospels. It is the fifth day of Holy Week, and is preceded by Holy Wednesday and followed by Good Friday.
The date is always between 19 March and 22 April inclusive, but these dates fall on different days depending on whether the Gregorian or Julian calendar is used liturgically. Eastern churches generally use the Julian calendar, and so celebrate this feast throughout the 21st century between 1 April and 5 May in the more commonly used Gregorian calendar. 
The liturgy held on the evening of Maundy Thursday initiates the Easter Triduum, the period which commemorates the passion, death, and resurrection of Christ; this period includes Good Friday, Holy Saturday, and ends on the evening of Easter. 
The service of worship is normally celebrated in the evening, when Friday begins according to Jewish tradition, as the Last Supper was held on feast of Passover.
The English word “Maundy” in that name for the day is derived through Middle English and Old French mandé, from the Latin mandatum, the first word of the phrase "Mandatum novum do vobis ut diligatis invicem sicut dilexi vos" ("A new commandment I give unto you, That ye love one another; as I have loved you"), the statement by Jesus in the Gospel of John 13:34 by which Jesus explained to the Apostles the significance of his action of washing their feet. The phrase is used as the antiphon often sung during the "Mandatum" ceremony of the washing of the feet.
However, some theorize that the English name "Maundy Thursday" arose from "maundsor baskets" or "maundy purses" of alms which the king of England distributed to certain poor at Whitehall before attending Mass on that day. Thus, "maund" is connected to the Latin mendicare, and French mendier, to beg.  Some argue that, if the name was derived from the Latin mandatum, we would call the day Mandy Thursday, or Mandate Thursday, or Mandatum Thursday; and that the term "Maundy" comes from the Latin mendicare, Old French mendier, and English maund, which as a verb means to beg and as a noun refers to a small basket held out by maunders as they maunded.