Singer Terry Chance and his band, the Mavericks, will headline a show at Francis William Bird Park on Saturday.  Folk rocker Patrick Destoop and his sons, and Yani Batteau and the Styles also will perform in a concert sponsored by the Victory Assembly of God and for the benefit of the park. Gates open at 4 p.m., and the show is scheduled to start at 4:30 p.m. Admission is $10; children 12 and under are free. Concertgoers should bring blankets or lawn chairs. Parking is available off Polley Lane.