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The Andover Artists Guild, a community of Merrimack Valley artists, is exhibiting an abstract art show in the community meeting room at Stevens Memorial Library, 345 Main St., through Sept. 30. In association with the show, there have been art workshops offered at the library during the month. The final workshop in the series, a program on stamping, will be offered from 2 to 4 p.m. Saturday. The workshop is appropriate for patrons age 7 and older, including adults. Seating is limited; preregistration is required. For more information or to preregister, call the library at 978-688-9505, ext. 42016.