About 400 barbershop singers are expected to attend the annual spring competition and convention of the Central States District of Barbershop Harmony Society, April 24-25 at the Gillioz Theatre in Springfield. The Quartet Finals and Show of Champions at 6:30 p.m. Saturday April 25 is open to the public. Tickets will be $29 at the door. The box office opens at 6 p.m. The weekend is hosted by the local Sho-Me Statesmen chorus. For more information about the event, call Ron Morse at 894-7417.