HART’S WAR Gary Hart, the former Colorado senator and presidential candidate, presents a discussion over breakfast of his latest book, “The Shield and the Cloak: The Security of the Commons” (Oxford University Press). (Friday, 8-9:15 a.m., Carnegie Council, Merrill House, 170 E. 64th St., between Third and Lexington avenues, 212-838-4120, $25 includes breakfast). Later in the day, Mr. Hart reads from and signs his book on the Upper West Side (Friday, 7 p.m., Barnes & Noble Upper West Side, 2289 Broadway at 82nd Street, 212-362-8835, free).

COMMUNAL ROOTS A history symposium, “Keeping the Faith in Brooklyn,” features scholars, archivists, and historians from the “borough of churches” exploring the beginning of the Jewish community there. The event, which features an exhibit that includes a map of Brooklyn churches circa 1860, is part of Kane Street Synagogue’s celebration of its 150th birthday. Sunday, 9:30 a.m.-5 942 2175 1115 2185p.m., Kane Street Synagogue, 236 Kane St., between Court and Clinton streets, Cobble Hill, Brooklyn, 718-875-1550, $15 in advance, $20 at the door, $10 afternoon sessions, $5 discount for seniors and students. Note: For a complete schedule, go to www.kanestreet.org/calendar.html.

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