Tisha B’Av (the Ninth of Av), while not a holiday God commanded in Scripture, commemorates the destruction of the First and Second Temples. The date has become synonymous with mourning and tragedy. This year, Tisha B’Av begins at sundown, July 19. (It so happens that the 19th also marks two months since Moishe’s home-going.) For more on Tisha B’Av, click here.