Cultural CalendarRICHMOND:Richmond Symphony Woodwind Quintet, April I' Mosque 8 in p.m.The UiircN|iit* Quartet Virginia Chamber Muilt Society April 17 Virginia Museum Theater, 8:15 p.m.Il'HtiiMr llarksiliilc I heati lt;% That ». - Sit t , April IVMny 30, 8: 30 p.iuAnnual Costume Exhibition .»t Valentine MiiitMitti* \ lt;\ MPl sSluclrnt Rm.lt.il Willi,ml Merer, vocalist .nul )tiliimiK* I).Plum piunim, April 12, Keller Mull, 4 p.m.Combined (»!«*• Cltih Concert Richmond College and Averett College April 12, First baptist Church, 7s SO p.m.Htmior Vocal Recital Joyce Snnfiml. April 15, Keller Hull, It SO pml.ccturer In residence Howard Nmmnov, poet, novollM. willt on ruinpun nil week.