Shabbat Chazon
Begins at sundown on Friday, 24 July 2020 (4th of Av, 5780)
Shabbat Chazon (“Sabbath [of] vision” שבת חזון) takes its name from the Haftarah that is read on the Shabbat immediately prior to the mournful fast of Tisha B’Av, from the words of rebuke and doom coming from Isaiah in the Book of Isaiah 1:1-27. It is also referred to as the Black Sabbath due to its status as the saddest Shabbat of the year (as opposed to the White Sabbath, Shabbat Shuvah, immediately precededing Yom Kippur).
Source hebcal