The annual Stein Chamber Music Festival, an event honoring a longtime Belmont music supporter, will take place next Sunday with performances at 5 and 7 p.m. at All Saints’ Episcopal Church, 7 Clark St. The festival gives area musicians the opportunity to perform and enjoy chamber music. Musicians of all ages and career stages will perform at the event, which was created more than 30 years ago to honor Joseph Stein, a longtime Belmont resident and lover of chamber music. The festival now also honors his wife, Lise, who died in 2007. Visit www.powersmusic.org for more information.