Hull: The third annual Harry Potter Marathon Reading supports the Hull Public Library. Enjoy baked goodies and listen to “Harry Potter and the Prisoner of Azkaban” read aloud by local readers. Free, but donations to the Friends of the Hull Public Library accepted. Saturday, 8 a.m. to 8 p.m. Weir River Estuary Center, 333 George Washington Blvd.
Hingham: The Hingham Public Library presents “Discovering Your Ancestors” with genealogist Michael Brophy. Vital records, court records, and census returns will be discussed along with recommendations of useful websites. Tuesday, 7 to 8:30 p.m., Hingham Public Library, 66 Leavitt St. Free. 781-741-1405, www.hinghamlibrary.org.