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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.

"THE SORCERER'S Apprentice" -- Friday at 10:30, Saturday at 3:30, Sunday at 12:30 and 3:30. $7.50 to $12. Reservations recommended. Imagination Stage Lerner Theatre, 4908 Auburn Ave., Bethesda. 301-280-1660.

MR. DAVE -- magic show, Friday at 11:30. Free. Wilde Lake Village Center, 10451 Twin Rivers Rd., Columbia. 443-367-0110.

FAIRFAX SYMPHONY Percussion Duo -- Saturday at 10. Lake Fairfax Park, 1400 Lake Fairfax Dr., Reston. 703-471-5415 or 703-324-8680.

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

KAYDEE PUPPETS -- Saturday at 10. Ellanor C. Lawrence Park, 5040 Walney Rd., Centreville. 703-631-0013

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

"THE TALE OF THE FISHERMAN and the Golden Fish," adapted from a poem by Alexander Pushkin, through Aug. 15. Saturday and Sunday at noon. $12 in advance, $15 at the door. Classika Theatre, 4041 S. 28th St. Arlington. 703-824-6200.

"THE ENCHANTMENT OF DREAMS" -- a new opera for children by composer Cary John Franklin and librettist Michael Patrick Albano in which children are visited by "dream helpers" while they sleep, performed by the children in the Washington National Opera's annual Opera Camp for Kids. Saturday and Sunday at noon and 2 at Round House Theatre, East West Highway and Waverly Street, Bethesda. Free, but reservations required; call 202-448-3465. Monday at 6 at the Kennedy Center's Millennium Stage. Free, no reservations needed; call 202-467-4600.

"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.

TURNER, DEAN OF MAGIC -- Thursday at 6. Free. Dorsey's Search Village Center, Dorsey Hall Drive and Columbia Road, Columbia. 443-367-0110.

Special Events

MODEL TRAIN DISPLAY -- Sunday noon to 5, by National Capital Trackers. $2, ages 4 to 10 $1. Fairfax Station Railroad Museum, 11200 Fairfax Station Rd., Fairfax Station. 703-425-9225.

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 -- Exhibitions: "Brain Teasers"; "Japan: Through the Eyes of a Child"; "Chemical Science Center"; "Mexico"; "Animation"; "Cityscapes." Open Tuesday 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.

DOLLEY MADISON -- Stories for ages 3 to 5, Wednesday at 10:30. 1244 Oak Ridge Ave., McLean. 703-356-0771.

GREENBELT -- Stories for ages 3 to 5, Thursday at 10:30. 11 Crescent Rd. 301-345-5800.

HILLCREST HEIGHTS -- Stories for ages 3 to 5, Tuesday and Thursday at 10:30. 2398 Iverson St. 301-630-4900.

HYATTSVILLE -- Stories in Spanish and English for ages 3 to 6, Saturday at 10:30. Stories for ages 3 to 5, Tuesday at 11. Stories for ages 3 to 6, Wednesday at 7. 6530 Adelphi Rd. 301-985-4690.

KINGSTOWNE -- Activities for ages 6 to 12, Tuesday at 2, and for ages 3 to 6, Thursday at 10:30. 500 Landsdowne Center, Alexandria. 703-339-4610.

KING'S PARK -- Activities for ages 6 to 12, Wednesday at 2. 9000 Burke Lake Rd., Burke. 703-978-5600.

LARGO-KETTERING -- Stories for ages 3 to 5, Saturday at 10:30 and Thursday at 11. 9601 Capital Lane, Upper Marlboro. 301-336-4044.

LAUREL -- Stories for ages 3 to 6, Wednesday at 7 and Thursday at 10:30. Stories for ages 6 to 9, Wednesday at 7:30. 507 Seventh St. 301-776-6790.

LORTON -- Stories for ages 2 to 5, Tuesday at 10:30. 9520 Richmond Hwy. 703-339-7385.

MARTHA WASHINGTON -- Stories for ages 2 to 5, Thursday at 10:30. 6614 Fort Hunt Rd., Alexandria. 703-768-6700.

NEW CARROLLTON -- Stories for ages 3 to 7, Saturday at 10:30 and Tuesday at 7. Stories for ages 3 to 5, Thursday at 10:15. 7414 Riverdale Rd. 301-459-6900.

SPAULDINGS -- Stories for ages 3 to 5, Thursday at 10:30. 5811 Old Silver Hill Rd., District Heights. 301-817-3750.

TYSONS-PIMMIT -- Model airplane workshop for ages 11 to 14, Saturday at 1. Activities for ages 6 to 12, Monday at 2. 7584 Leesburg Pike, Falls Church. 703-790-8088.

UPPER MARLBORO -- Stories and activities for ages 3 to 5, Tuesday and Wednesday at 11. 14730 Main St. 301-629-9330.

WOODROW WILSON -- Stories about polar bears for ages 6 to 12, Thursday at 2. 6101 Knollwood Dr., Falls Church. 703-820-8774.