Beginning of new Hebrew month of Av. Av is the 5th month of the Hebrew year. Corresponds to July or August on the Gregorian calendar https://www.hebcal.com/holidays/rosh-chodesh

Shabbat before Tish'a B'Av (Shabbat of Prophecy/Shabbat of Vision) https://www.hebcal.com/holidays/shabbat-chazon?utm_source=js&utm_medium=icalendar