Holy Thursday is a part of Holy Week at Easter, and also named Maundy Thursday.
In Christianity it is recalled as the day of the 'Last Supper'.
Also associated with the establishment of the Eucharist.
Roman Catholic services will often involve a ceremony where priest washes the feet of 12 people to commemorate Jesus washing the feet of his disciples.
The date is variable according to the Easter calendar, it usually not a public holiday and held the Thursday before Easter Sunday.