The group Maverick will give the guest performance at the Greater Cranberry Men’s Chorus and Sharp Edge Quartet show at 4 p.m. Saturday at the Kean Theater, 5847 Meridian Road, Gibsonia. The a cappella concert will have the theme “Around the World in Harmony.” Advanced tickets are $14 for adults and $6 for students. Any available tickets will be sold at the door for $16 for adults and $6 for students. Call 724-869-7563 or 724-444-5326.