Self-guided walking tours of historic Lexington, Va., originate at Sloan House, the town's visitor center, located at 107 E. Washington St. Sloan House is open daily 9 a.m. - 5 p.m. and tour maps can be picked up free of charge. Each tour (there are three) can be walked in little more than an hour. Details 703-463-3777. Today

Opening of "Plants and Planters for Spring," 2-5 p.m., Thought Gallery, 76 East St., Annapolis, continuing through Apr. 1. Details and hours: 942-3554.

Conclusion of the Vienna Community Center Spring Antique Show, noon-6 p.m., 120 Cherry St. SE, VIenna. Admission. Details: 938-8000.

Conclusion of the Holy Redeemer Catholic Church 10th Annual Antiques Show, 1-6 p.m., Szul Road and Summit Avenue, Kensington. Admission. Setails 933-5485.

Sully Plantation Tea and lute Concert, 3-7 p.m., Rte. 28, Chantilly, Va. Admission. Details 437-1794. This week

Washington Society of Printmakers Show, opening Monday and running weekdays, Art Department Gallery, Montgomery College, Rockville, through Mar. 23. Details and hours 762-7400 ext. 222.

Chinese Silk Embroidery Exhibit and Sale, opening Monday and running Monday-Saturday. Connoisseur Gallery of Woodward & Lothrop's Washington store, through Mar. 19. Details and hours: 347-5300.

Exhibit of 19th- and 20th-century flatwoven and knotted pile rugs, Tuesday-Saturday, Balcony Gallery, Textile Museum, 2320 S St. NW, trhough Summer. Details and hours: 667-0041.

D.C. Art Association Exhibition: drawings, prints, sculpture, collage, needlework, Wednesday-Sunday. The Art Barn, 2401 Tilden St., NW, through Mar. 27. Details and hours: 436-6719.

"Outdoor Living Clay in Nature," Washington Kiln Club exhibit and sale, opening Friday and running Tuesday-Sunday, Scope Gallery, Torpedo Factory, King and Union Streets, Alexandria, through Mar. 27. Details and hours: 548-6288.

Poet/Craftsman Dialogue: with textile artist Jody Klein and poet Mark Mandel, who collaborated on two works for the Renwick's "The Object as Poet" exhibit, 8 p.m. Friday, Renwick's Grand Salon. Details: 628-4122.

Persons interested in displaying or selling artwork or handicrafts at the Fourth Annual Crofton, Md., Arts and Crafts Fair scheduled for April 30, may reserve space by calling 261-3481. Publications

"Smoke Detectors - What They Are and How They Work," a National Bureau of Standards pamphlet that answers most commonly asked questions about selection and placement of smoke detectors in the home, available from: Detectors, Consumer Information Center, pueblo, Colo. 81009. Free.