Also known as Maundy Thursday, it is celebrated on the Thursday before Easter commemorating the Last Supper, at which Jesus and the Apostles were together for the last time before the Crucifixion.

Source:

“Calendar of Observances.” Anti-Defamation League, 2019,  www.adl.org/education/resources/tools-and-strategies/calendar-of-observances. Accessed 25 Sept. 2020.