Yud Shvat  Yud Shvat (the 10th day of the Hebrew month of Shevat) is a significant date on the Chabad Hasidic calendar. It is the "yahrtzeit" or anniversary of passing of the sixth Chabad Rebbe, Rabbi Yosef Yitzchak Schneersohn (1880–1950). The day also marks the formal acceptance of leadership in 1951 by the seventh Rebbe, Rabbi Menachem Mendel Schneerson (1902–1994). On Yud Shvat, Rabbi Menachem Mendel formally accepted the leadership of Chabad-Lubavitch movement with a public address and Hasidic discourse ("maamar") at a gathering marking the first anniversary of his predecessor’s passing. In 2004, an international conference was founded for the rabbinical students of the Chabad yeshivot to occur on Yud Shvat. The conference is called ""Kinus Tmimim Haolami"". The event is organized by Vaad Talmidei Hatmimim Haolami. The seventh Chabad Rebbe, Rabbi Menachem Mendel Schneerson, issued a public letter instructing Chabad Hasidim how to observe the "yahrtzeit" (anniversary of passing) of his father-in-law and predecessor, the sixth Chabad Rebbe, Rabbi Yosef Yitzchak Schneersohn. The letter outlines 16 customs. The Chabad community also adapted these customs on the Rebbe’s own yahrtzeit, on the Third of Tammuz. The customs include: