Richard Irons, noted master restoration mason, will lecture on the evolution of fire places, hearth cooking and the preservation of fireplaces. The tour includes an “Early Georgian” home at 6 Independent Street, a “Federal” style at 4 Fruit Street and a “Greek Revival” at 21 Monroe St. Admission: $30. Limited reservations are required (www.nbptpreservationtrust.org) for a total of 20 people on the tour or call 978-358-7880