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Performances

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

"DINOSAUR BOOK OF WORLD Records" by Dinorock Productions, through Sept. 4. Friday at 10 and 11:30, Saturday-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.

MISTER DON -- Saturday at 10. Burke Lake Park, 7315 Ox Rd., Fairfax Station. 703-323-6601 or 703-324-7469.

FAIRFAX SYMPHONY BRASS Quintet -- Saturday at 10. Ellanor C. Lawrence Park, 5040 Walney Rd., Centreville. 703-631-0013 or 703-324-7469.

THE GOODLIFE THEATER -- Saturday at 10. Lake Fairfax Park, 1400 Lake Fairfax Dr., Reston. 703-471-5415 or 703-324-7469.

"THE BARKER OF SEVILLE" by Blue Sky Puppet Theater, Saturday at 10. Newton W. Edwards Amphitheater, Mason District Park, 6621 Columbia Pike, Annandale. 703-941-1730 or 703-324-7469.

"CINDERELLA" -- Saturday and Sunday at noon. $12 in advance, $15 at the door. Classika Theatre, 4041 S. 28th St. Arlington. 703-824-0660.

"HYRONOMOUS A. FROG, the Frog Prince" -- through Sept. 4. 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 -- "Sailing Around the World," Wednesday at 3 and 6:30. $18 to $33 plus service charges. MCI Center, 601 F St. NW. 202-397-7328 or 202-628-3200.

Special Events

MODEL TRAIN DISPLAY -- Sunday 1 to 4, by the Northern Virginia NTRAK club. $2, ages 4 to 10 $1. Fairfax Station Railroad Museum, 11200 Fairfax Station Rd., Fairfax Station. 703-425-9225.

ROSE HILL FESTIVAL -- Sunday: ice cream social, noon to 3, with lawn games and hands-on crafts; mansion tours, noon to 4; antique car show, 10 to 3. Fees charged for some activities. Rose Hill Manor Park, 1611 N. Market St., Frederick. 301-694-1650.

"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 8 p.m.; most animal buildings and Amazonia open 10 to 6 (exceptions are posted). Seal and sea lion training at 11:30, elephant care sessions at 11 most days. 3001 Connecticut Ave. NW. 202-633-4800.

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, 202-397-7328 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

MARYLAND SCIENCE CENTER -- Exhibits: "Titanic: The Artifact Exhibition," through Sept. 5; "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, depending on options selected, $14-$19.50, ages 4 to 12 $9.50-$13.50. Open Friday-Saturday 10 to 8, Sunday-Wednesday 10 to 6, Thursday 10 to 8.601 Light St., Baltimore. 410-685-5225.

PORT DISCOVERY -- "Miffy and Friends," through May 15. 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. $5. 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. $8.95, seniors and ages 2 through 12 $6.95, younger free. Wagon rides $1, pony rides $2.50. 19270 James Monroe Highway, Leesburg. 703-433-0002.

GARGOYLE'S DEN -- Saturday 10 to 2, for ages 6 to 12. Explore stone carving, mosaics, stained glass and other crafts. $5 per group of up to 4; each additional person $1. 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 $5, seniors and students $4, under 13 $2. Open Friday-Saturday 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 8. $5, seniors $4, ages 3 to 16 $3. World Trade Center, 401 E. Pratt St., Baltimore. 410-837-8439.

Library Programs

ACCOKEEK -- Stories for ages 3 to 5, Tuesday at 10:30, and for ages 3 to 6, Wednesday at 7. 16200 Livingston Rd. 301-283-2521.

BELTSVILLE -- Stories for ages 3 to 5, Wednesday at 10:30. 4319 Sellman Rd. 301-937-0294.

BOWIE -- Stories for ages 3 to 5, Saturday and Thursday at 10:30. 15210 Annapolis Rd. 301-262-7000.

CENTREVILLE -- Stories for ages 2 to 5, Monday at 10:30. 14200 St. Germaine Dr., Centreville. 703-830-2223.

CHANTILLY -- Activities for ages 8 to 12, Friday at 2. Stories and games for all ages, Thursday at 7. 4000 Stringfellow Rd., Chantilly. 703-502-3883.

DOLLEY MADISON -- Stories for ages 2 to 5, Friday at 12:30. Teddy Bear picnic, Tuesday at noon for all ages. 1244 Oak Ridge Ave., McLean. 703-356-0771.

FAIRMOUNT HEIGHTS -- Storytime for ages 3 to 5, Wednesday at 10:30. 5904 Kolb St. 301-883-2700.

GEORGE MASON -- Activities for ages 8 to 12, Wednesday at 10:30. 7001 Little River Tnpk., Annandale. 703-256-3800.

GLENARDEN -- Stories for ages 2 to 5, Thursday at 10:30. 8724 Glenarden Pkwy. 301-772-5477.

GREAT FALLS -- Stories and activities for ages 1 to 5, Monday at 10:30. 9830 Georgetown Pike, Great Falls. 703-757-8560.

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

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

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

LORTON -- Stories for ages 4 to 5, Friday at 11. 9520 Richmond Hwy. 703-339-7385.

MARTHA WASHINGTON -- Activities for ages 6 to 12, Tuesday at 2. Stories and crafts for ages 2 to 5, Thursday at 10:30. 6614 Fort Hunt Rd., Alexandria. 703-768-6700.

MOUNT RAINIER -- Stories for ages 3 to 5, Wednesday at 11. 3409 Rhode Island Ave., Mount Rainier. 301-864-8937.

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

POHICK -- Videos for ages 2 to 6, Friday at 11:30. Stories about outer space for ages 2 to 5, Monday at 10:15. 6450 Sydenstricker Rd., Burke. 703-644-7333.

RESTON -- Stories for ages 4 to 7, Friday at 10:30. Activities for ages 8 to 12, Thursday at 2. 11925 Bowman Towne Dr. 703-689-2700.

SPAULDINGS -- Stories for ages 2 to 6, Monday at 7, and for ages 3 to 5, Thursday at 10:30. 5811 Old Silver Hill Rd., District Heights. 301-817-3750.

TYSONS-PIMMIT -- Activities for ages 3 to 5, Thursday at 11. 7584 Leesburg Pike, Falls Church. 703-790-8088.

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

WOODROW WILSON -- "Reptiles Alive" for ages 6 to 12, Thursday at 11. 6101 Knollwood Dr., Falls Church. 703-820-8774.