Shabbat after Tish’a B’Av (Shabbat of Consolation). The first of seven Shabbatot leading up to Rosh Hashanah. Named after the Haftarah (from Isaiah 40) which begins with the verse נַחֲמוּ נַחֲמוּ, עַמִּי (“Comfort, oh comfort my people”)
https://hebcal.com/h/shabbat-nachamu-2027?uc=ical-diaspora