The Milton Public Library this month officially launched its program aiming to unite the town through one book. The Milton Reads! program is encouraging all residents to read Harper Lee’s “To Kill a Mockingbird’’ and participate in activities related to the book. The events will take place through September, October, and November, and include drop-in book discussions, film screenings, and a symposium with US Attorney Carmen Ortiz. The first event is a screening of the movie “To Kill a Mockingbird” at the Council on Aging this Friday at 1 p.m. Copies of the book are available for $5 at the Friends of the Library bookstore. To join the Milton Reads! mailing list, e-mail email@example.com. For more information, visit www.miltonreads2012.wordpress.com or call the library at 617-698-5757.