by Helen Epstein Go here for information about a live-chat, scheduled for August 23rd, with Helen Epstein on “The Art of Narrative Writing.” If you’re at all interested in popular culture, don’t miss Aviva Kempner’s new documentary “Yoo-Hoo Mrs. Goldberg.” Kempner is the D.C.-based director of the award-winning documentary “Life and Times of Hank Greenberg”…