Maine Lighthouse Museum, 1 Park Drive in Rockland, will host Maine author Cornelia J. Cesari on Friday, September 14, from 1 to 4 p.m. She will be signing copies of her book “Baker Island.” Settled in 1806 by one family. Baker Island’s population peaked at about two dozen people in five households at mid-century. The U.S. government made use of the island’s strategic location at the entrance to Frenchman’s Bay with a lighthouse and military facilities. Wealthy, artistic and academic summer visitors — so-called rusticators — discovered its charm However, by 1930, only the lightkeeper’s family remained. The island is now mostly part of Acadia National Park, and park rangers lead interpretive tours almost daily, leaving from Bar Harbor for half-day visits to the island.