Harvard professor and CNN political analyst David Gergen chatted with Brigham and Women’s Hospital president Dr. Betsy Nabel and Dr. Katherine Gergen Barnett — David’s pregnant daughter — at the Koch Gallery at the MFA during the first meeting of Nabel’s new advisory council. . . . Brookline-bred talk-show host Conan O’Brien and his family had lunch Friday at Legal Sea Foods in Chestnut Hill. . . . Sox DH David Ortiz had breakfast at Artisan Bistro at the Ritz-Carlton, Boston Common, on Friday.