Alameda Waterpark, 184 Alameda Road, will be open through Labor Day, Sept. 7. For more information, call the Butler County Parks and Recreation Department at 724-284-5383.

SAXONBURG — The Friends of South Butler Community Library, 240 W. Main St., will have its annual used book tent sale from 10 a.m. to 4 p.m. Sept. 11, 10 a.m. to 6 p.m. Sept. 12 and 10 a.m. to 5 p.m. Sept. 13. There will be an early bird sale from 9 to 10 a.m. Sept. 11 for a fee.More than 10,000 books will be for sale.The event will coincide with the 30th annual Festival of the Arts in Saxonburg.The group also will sell raffle tickets for a drawing Sept. 13. First prize will be more than $400 in gift cards, second prize will be a golf outing for two and third prize will be $50.

MIDDLESEX TWP —The Lighthouse Foundation, 1302 E. Cruikshank Road, will offer free computer classes beginning Sept. 16.The classes will be Computer for Beginners, Microsoft Excel and Digital Photography.For more information, call Dave Miller at the Lighthouse at 724-586-5554, Ext. 250.