Union Historical Society will offer its annual narrated bus tour of early historic sites during the town’s Founders Day weekend. Tours depart from the Old Town House on Town House Road, just off Union Common, at 5:30 p.m. on Friday July 18 and at 9:30 a.m. on Saturday July 19. All the sites visited during the 2-hour tour are related to the settlers mentioned in Come Spring, Ben Ames Williams’ 1940 historic novel, which in turn is based on information in John Langdon Sibley’s 1851 History of the Town of Union. Four of the sites are located on private property and are not open to the public at other times. Tickets are priced at $12 for the Friday tour and $25 for the Saturday tour, which is in an air-conditioned coach. To purchase tickets, call Union Historical Society at 785-5444 and leave a message, or come to the Old Town House at least 30 minutes before the tours depart.