The 5th of Av (Thursday night - Friday) is the 447th "Hilula" (yahrzeit celebration) of the Holy Ari, Rabbi Yitzchak Luria, greatest of the Tzefat Kabbalists (articles 1-2).
Starting Rosh Chodesh Av (Monday, August 5)), the semi-mourning strictures of the 3 Weeks leading up to Tisha b'Av intensify — see article #7 about The Nine Days.
This Shabbat, before the Tisha b'Av 24 hour fast, has a special name: "Shabbat Hazon" — "The Shabbat of Vision" — see article #6.
Articles #3-5 are for the Weekly Reading, the first one in the Fifth "Book of Moses", called Devarim ("Deuteronomy").