The 1920s-era Murphey School in Orange County sat abandoned for years until Jay Miller, a philanthropist with a soft spot for historic properties, bought it and restored it. Now the school serves as an incubator space for small nonprofits associated with Miller’sSharedVisions Project, while the auditorium serves as a community performance space. On Saturday night, Triangle area musicians and writers will gather to perform an old-time radio variety show in the school’s auditorium to raise money for local organizations. Among those participating will be accordion player Jay Cartwright.