'the eleventh of Nissan') is a holiday on the Chabad-Lubavitch calendar that marks the birthday of the Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson.

April 5] 1902 (11 Nissan, 5662), in the Black Sea port of Nikolaev in the Russian Empire (now Mykolaiv in Ukraine).

[3] After the Lubavitcher Rebbe passed away on June 12, 1994 (3 Tammuz 5754), his followers intensified their celebrations of his birthday, observing it with even greater enthusiasm than when he was alive.

[8] The first proclamation was made by President Jimmy Carter, who acknowledged the Lubavitcher Rebbe’s influence in shaping education.

[10] [11] This day was established to honor the Lubavicher Rebbe's commitment and contributions to education and moral values, which he believed were essential for a healthy society[12][13]