WASHINGTON NATIONAL CATHEDRAL TRIP, for ages 55 and older. Includes an organ demonstration in the Great Choir, a guided walking tour of the cathedral and tea in the Observation Gallery, with views of the city; bring lunch for the bus ride. Sponsored by the Howard County Department of Recreation and Parks; 11 a.m.-5 p.m.; call for bus departure points in Howard County. $49; registration required. 410-313-7279.
COLONIAL MARYLAND PORTRAYAL, for ages 18 and older. Nancy Smith portrays an indentured servant from 18th-century Maryland and talks about family life, culture and customs of the period. 7 p.m., Howard County Central Library, 10375 Little Patuxent Pkwy., Columbia. Free; registration required. 410-313-7860.
COLUMBIA CHESS CLUB, for children ages 9-17 of all skill levels with a basic understanding of the game. 7-8:30 p.m. Wednesday, Elkridge Branch Library, 6540 Washington Blvd., Elkridge, 410-313-5088; 7-8:30 p.m. April 28, Glenwood Branch Library, 2350 Route 97 (Roxbury Mills Road), Cooksville, 410-313-5577. Free.
COLUMBIA VISION SCREENING, for all ages. Sponsored by Howard County General Hospital; 9-11 a.m., Wellness Center, Columbia Medical Center, Suite L-9, 11055 Little Patuxent Pkwy. Free; registration required. 410-740-7601.
SENIORS FIRESIDE CHAT, "Retirement Ain't For Sissies." Discussion about the challenges of retiring well, including learning how to interview yourself for retirement and learning about stages of retirement. Sponsored by the Howard County Office on Aging; 10:30 a.m., the Bain Center, formerly Florence Bain Senior Center, 5470 Ruth Keeton Way, Columbia. Free; registration required. 410-313-7213.
-- Compiled by LINDA JAMES
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