Maya Soetoro-Ng, sister of President Barack Obama, has published a children’s book called Ladder to the Moon, a story that evokes fantasy and folklore with personal elements included. At a literary luncheon, Soetoro-Ng discusses the inspiration behind her book—as well as fields inevitable questions about her brother—on Thursday, April 21, at Book Passage. 51 Tamal Vista Blvd., Corte Madera. Noon. $55 includes lunch and a signed book. 415.927.0960.