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Performances

These events for children and families are free unless a fee is noted.

"DREAMOSAURUS" by Dinorock Productions, through Sept. 5. Friday at 10 and 11:30; Saturday and Sunday at 11:30 and 1; Wednesday-Thursday at 10 and 11:30. $7. Reservations recommended. The Puppet Co. Playhouse, Glen Echo Park, 7300 MacArthur Blvd., Glen Echo. 301-320-6668.

"TURNER, DEAN OF MAGIC" -- Friday at 6. River Hill Village Center, 6030 Daybreak Circle, Columbia. 443-367-0110.

THE GOODLIFE THEATER -- Saturday at 10. Lake Fairfax Park, 1400 Lake Fairfax Dr., Reston. 703-471-5415 or 703-324-8680.

KAYDEE PUPPETS -- Saturday at 10. Burke Lake Park, 7315 Ox Rd., Fairfax Station. 703-323-6601 or 703-324-8680.

FAIRFAX SYMPHONY Brass Quintet -- Saturday at 10. Ellanor C. Lawrence Park, 5040 Walney Rd., Centreville. 703-631-0013

FAIRFAX SYMPHONY Percussion Duo -- Saturday at 10. Mason District Park, Newton W. Edwards Amphitheater, 6621 Columbia Pike, Annandale. 703-941-1730 or 703-324-8680.

THE WIGGLES -- Saturday and Sunday at 1 and 4:30. $16 to $31 plus service charges. Patriot Center, George Mason University, 4400 University Dr., Fairfax. 202-397-7328 or 703-993-8888.

"THE ADVENTURES OF A BEAR Called Paddington," through Aug. 29. Saturday and Sunday at 1:30 and 3:30. $7. Adventure Theatre, Glen Echo Park, 7300 MacArthur Blvd., Glen Echo. 301-320-5331.

THE WIGGLES -- Tuesday and Wednesday at 3 and 6:30. $15 to $30 plus service charges. 1st Mariner Arena, 201 W. Baltimore St., Baltimore. 202-397-7328 or 410-347-2010.

Special Events

"IMAGINASIA" -- Tuesday- Thursday at 2. Art tour and workshop for ages 6 to 14. Arthur M. Sackler Gallery, 1050 Independence Ave. SW. 202-357-2700 (TDD: 202-357-1729).

Nature

NATIONAL ZOO -- Grounds open daily 6 a.m. to 6 p.m., most animal buildings and Amazonia open 10 to 4:30 (exceptions are posted). Seal and sea lion training at 11:30, elephant care sessions at 11 most days. 3001 Connecticut Ave. NW. 202-673-4800.

NATIONAL AQUARIUM -- More than 1,000 specimens of aquatic life, including an alligator exhibit. Open daily 9 to 5 (last admission 4:30). Adults $5, seniors $4, ages 2 to 10 $2, younger free. Department of Commerce Building, 14th and Constitution NW. 202-482-2825.

BALTIMORE AQUARIUM -- The National Aquarium in Baltimore features a marine mammal pavilion, an Atlantic coral reef exhibit and a South American rain forest. Timed-entry tickets required. Open Friday 9 to 8, Saturday-Thursday 9 to 5. Admission $17.50; seniors $14.50; ages 3 to 11 $9.50 (under 3 free). Pier 3, 501 E. Pratt St., Baltimore. For information, 410-576-3800; for advance tickets, Ticketmaster, 202-432-7328 or 410-481-7328 (service charges added).

NATIONAL WILDLIFE VISITOR Center -- Interior Department science and environmental education center offers interactive exhibits and films. Open daily 10 to 5:30. Patuxent Research Refuge, 10901 Scarlet Tanager Loop, Laurel.

301-497-5760.

ROCK CREEK NATURE CENTER -- Planetarium shows: "The Night Sky," Saturday and Sunday at 1 for ages 4 and up; "Exploring the Universe," Saturday and Sunday at 4 for ages 7 and up; planetarium show for younger children, Wednesday at 4 for ages 2 to 10. Free planetarium tickets distributed 30 minutes before each show. 5200 Glover Rd. NW. 202-895-6070.

Places to Visit

CAPITAL CHILDREN'S MUSEUM -- The museum closes permanently after this weekend. Exhibitions: "Brain Teasers"; "Japan: Through the Eyes of a Child"; "Chemical Science Center"; "Mexico"; "Animation"; "Cityscapes." Open Friday through Sunday 10 to 5. $7, seniors $5, ages 2 and under free. 800 Third St. NE. 202-675-4120.

MARYLAND SCIENCE CENTER -- Exhibits: "Dino Digs," about dinosaurs native to Maryland; "Chesapeake Bay"; "Outer Space Place." Hands-on exhibits and demonstrations of scientific principles. IMAX films screened hourly. Planetarium show, hourly. Admission, including planetarium show and IMAX, is $16, seniors $14, ages 3 to 12 $12.50. Open Friday 10 to 5, Saturday 10 to 6, Sunday noon to 5, Monday-Thursday 10 to 5. 601 Light St., Baltimore. 410-685-5225.

PORT DISCOVERY -- Interactive fantasy structures, mechanical sculptures and related activities. Open Friday-Saturday 10 to 5, Sunday noon to 5, Tuesday-Thursday 10 to 5. $11, ages 3 to 12 $8.50, under 3 free. 35 Market Pl., Baltimore. 410-727-8120.

DISCOVERY CREEK CHILDREN'S Museum -- Drop-in programs, Saturday and Sunday 10 to 3, through Aug. 29. $5, seniors $3, under age 2 free. Glen Echo Park, 7300 MacArthur Blvd., Glen Echo. 202-337-5111.

LEESBURG ANIMAL PARK -- Petting zoo and related activities, open Friday-Sunday 10 to 5, Tuesday-Thursday 10 to 3. $7.95, seniors and ages 2 through 12 $5.95, younger free. 19270 James Monroe Highway, Leesburg. 703-433-0002.

CATHEDRAL CRAFTS -- Saturday 10 to 2, for ages 6 to 12. Explore mosaics, stained glass, stone carving and crafts. $7; reservations required for groups larger than 10. Washington National Cathedral, Wisconsin and Massachusetts avenues NW. 202-537-2934.

CLAUDE MOORE COLONIAL FARM -- Visit a re-creation of an 18th-century family farm, open Friday-Sunday and Wednesday-Thursday from 10 to 4:30. $3, seniors and ages 3 to 12 $2. 6310 Georgetown Pike, McLean. 703-847-0710.

NATIONAL COLONIAL FARM -- The mid-18th-century tobacco plantation is open Friday-Sunday and Tuesday- Thursday from 10 to 5. Adults $2, under 12 50 cents; $5 maximum per family. 3400 Bryan Point Rd., Accokeek. 301-283-2113.

OXON HILL FARM -- The working farm is open daily from 9 to 4:30, with farm demonstrations and tours. Oxon Cove Park, 6411 Oxon Hill Rd., Oxon Hill. 301-839-1176 (TDD: 301-839-1783).

COLVIN RUN MILL -- Tour the 19th-century gristmill 11 to 5 daily except Tuesday. Adults $5, children $3. 10017 Colvin Run Rd., Great Falls. 703-759-2771.

OLD STONE HOUSE -- Tour the 1765 structure Friday-Sunday and Wednesday-Thursday noon to 5. 3051 M St. NW. 202-426-6851.

SULLY HISTORIC SITE -- The restored 1794 mansion, furnished with Federal-period antiques, is open from 11 to 4 daily except Tuesday. Hourly guided tours $5, students $4, seniors and ages 5 to 15 $3. 3601 Sully Rd., Chantilly. 703-437-1794.

TROLLEY MUSEUM -- Ride European and American trolleys, Saturday and Sunday noon to 5. Exhibits free; rides $3, seniors and ages 2 through 17 $2. Northwest Branch Park, 1313 Bonifant Rd., Silver Spring. 301-384-6088.

B&O RAILROAD STATION MUSEUM -- Permanent exhibits include a diorama depicting the trip of Tom Thumb, America's first scheduled passenger train. Adults $4, seniors and students $3, under 13 $2. Open Friday-Saturday and Monday 11 to 4, Sunday noon to 5. 2711 Maryland Ave., Ellicott City. 410-461-1944.

TOP OF THE WORLD -- Presentation about Baltimore and a view of the city from the 27th floor observation level. Open Sunday through Friday 10 to 6, Saturday 10 to 9. $4, seniors $3, ages 3 to 16 $2. World Trade Center, 401 E. Pratt St., Baltimore. 410-837-8439.

Library Programs

CHERRYDALE -- Stories for ages 3 to 7, Wednesday at 7. 2190 Military Rd., Arlington. 703-228-6330.

COLUMBIA PIKE -- Stories for ages 3 to 6, Monday at 11. 816 S. Walter Reed Dr., Arlington. 703-228-5710.

HYATTSVILLE -- Stories in Spanish and English for ages 3 to 6, Saturday at 10:30. 6530 Adelphi Rd. 301-985-4690.

LARGO-KETTERING -- Stories for ages 3 to 5, Saturday at 10:30. 9601 Capital Lane, Upper Marlboro. 301-336-4044.

NEW CARROLLTON -- Stories for ages 3 to 7, Saturday at 10:30. 7414 Riverdale Rd. 301-459-6900.