Wilton Library’s Awesome Autumn Book Sale Fundraiser, Sept. 21, 9-10 a.m., early buying, $5 and 10 a.m.-5 p.m., free; Sept. 22, 1-5 p.m.; Sept. 23, 10 a.m.-5 p.m., half price; Sept. 24, 10 a.m.-4 p.m., $5/bag, Wilton Library, 137 Old. Ridgefield Rd., Wilton. Proceeds benefit library. Info: wiltonlibrary.org, 203-762-3950.
CT Ukulele Festival, Sept. 21, 9 a.m.-9 p.m., Pequot Library, 720 Pequot Ave., Southport. Featuring Bruce Off Broadway, a Ukulele Tribute to the music of Bruce Springsteen, music, food and drink, workshops, strum-a-longs, free performances and an open mic competition. Portion of the proceeds will be donated to Smilow Family Breast Health Center at Norwalk Hospital. Info: ctukulelefestival.com.