Thursday, Aug. 11, 2016 5:30 p.m. to 12 a.m. Location: Maine Historical Society, 489 Congress St, Portland, Maine For more information: mainehistory.org PORTLAND — Paul Ledman, author of “Walking Through History: Portland, Maine, on Foot,” will be the guest at a reception to launch his book at 5:30 p.m. Thursday, …