The Worst Day in American Jewish History

My grandson was born the day after it happened. His name evokes the theme of consolation, and as his father said at his brit ceremony, perhaps this child will serve as a small consolation for what had happened. What is the "it" that happened? I am referring to the attack on Tree of Life synagogue in Pittsburgh -- Oct. 27, 2018, exactly three years ago -- which left 11 worshippers dead and a Jewish community devastated. Over the past three years, we have eulogized the dead.