The Newton-Needham Regional Chamber will host a talk with development and planning experts about what makes for a “truly walkable neighborhood” during a Sept. 12 real estate forum. The event will feature Jeff Speck, a planning expert who will discuss how the policy of “complete streets” — a design strategy that includes not just automotive traffic but also people walking, using public transit, or bicycling — is the correct tool to create better communities, according to a chamber statement. “In the typical American city in which most people have cars,’’ said Speck in the statement, “you need to offer a compelling reason for people to walk instead of drive, and that means offering a walk that is better than a drive.” A book by Speck, “Walkable City: How Downtown Can Save America, One Step at a Time,” focuses on steps cities have to take to “create more livable locations,” the chamber said. Other scheduled speakers include Robert Korff of Mark Development, who earlier this year secured permission from Newton officials to move ahead with a mixed-use development in Newtonville, and John Twohig of New England Development. The event will run from 4 p.m. to 7:30 p.m. at the Sheraton Needham, 100 Cabot St. in Needham.John Hilliard can be reached at firstname.lastname@example.org.