Happy Hour Service Center in Warner Robins, which serves developmentally disabled people, has been holding yard sales at the old post office on North Davis Drive since March, said Michelle Booth, retail manager and marketing director of Happy Hour. The group acquired the property last year, so it could expand its operation in the area. Happy Hour clients work at the yard sale, which are held every Friday and a couple Saturdays a month, as well as at the workshop there during the week. The new location has enabled us to be open more often and be more productive for the community, Booth said. Another yard sale is being held 8 a.m.-1 p.m. Saturday.