Believe it or not, there are some non-holiday activities this weekend, along with seasonal special events.

All free unless otherwise noted. NATIONAL ZOO -- Open seven days a week; gates open from 8 to 6; animal buildings, 10 to 4:30; panda feedings, 11 and 3, 3000 Connecticut Ave. NW, on the Metro Red Line. Family learning centers Zoolab and Birdlab open Friday through Sunday, noon to 3; Herplab open Wednesday through Sunday, noon to 3. 673-4717. OXON HILL FARM -- Open seven days a week, 8:30 to 5, Oxon Hill Road (take Beltway exit 3A, turn right on Oxon Hill Rd.,). Saturday, 3, help a farmer feed goats and put the chickens to roost during his afternoon chores. 301/839-1177. NATIONAL AQUARIUM -- Open seven days a week, 9 to 5, Department of Commerce, 14th and Constitution Avenue NW. The sharks are fed Monday, Wednesday and Saturday at 2; weekday features are a touch-tank, mini- theater and a thousand types of marine life. Saturday, 10, 11 and 2:30, pet a Sea Turtle and see how the sea creatures are cared for during a special behind-the-scenes tour. Adults $1; children 50 cents. 377-2825. CEDAR HILL -- Open seven days a week 9 to 4, 1411 W St., Anacostia. Cedar Hill, Frederick Douglass' home recalls his work with films, interpretive exhibits and a house tour. 426-5961 or 426-5962 or 426-5963.

USS BARRY -- Seven days a week, 10 to 5, including holidays, Washington Navy Yard. The Navy destroyer's weather deck is open for public viewing and self-guided tours. 433- CHILDREN'S MUSEUM -- Monday through Saturday, 10 to 4, Sunday, 1 to 4, Rose Hill Children's Museum, just north of Frederick, Maryland. Take U.S. 15 north to Exit 8 to Motter Avenue; follow Motter to left onto 14th Street and left onto North Market Street, follow signs to Rose Hill. Costumed tour guides will conduct tours of the 1790 mansion. Hands-on exhibits include a loom, antique toys and spinning wheel. Adults $1; under 17, free. 301/694-1646. DISCOVERY THEATER -- Tuesday through Friday, 10 and 11:30; Saturday, 1 and 3: Arts and Industries Building, 900 Jefferson Dr. SW. The Bob Brown Puppets perform "Puss in Boots." A cat wins the gift of magic boots through an act of kindness and then confronts an evil ogre and struggles for the freedom of the kingdom. $2.50, discounts for families and groups. 357-1500. CAPITAL CHILDREN'S MUSEUM -- Tuesday through Saturday, 10 to 4; Sunday 1 to 5, 800 Third St. NE. Saturday and Sunday, museum hours, sculpt Styrofoam into a variety of winter creations. Saturday, 1 and 2:30; Sunday, 2:30, The Puppet Company presents "Hansel and Gretel." Museum admission, $2. 543-8600. CLOISTERS CHILDREN'S MUSEUM -- Wednesday through Friday, 10 to 4:30; Saturday, 12 to 4, 10440 Falls Rd., Brooklandville, Maryland. Saturday,, The Children's Theater Association presents "The Princess and the Goblins," a fairy tale about a band of goblins' plot to kidnap Princess Irene. $2 donation requested from adults. 301/823- 2551. RAILROAD STATION MUSEUM -- Wednesday through Saturday, 11 to 4; Sunday, noon to 5, Main Street and Maryland Avenue, Ellicott City. A 1936 Coca-Cola case, Coca-Cola trays, signs, old advertising, clocks, mirrors, bottles and cans will be on display at the Coca-Cola Exhibit through December. There are also sight and sound shows, model train exhibits and tours of the museum. Adults $1.25; under 13, 75 cents. 301/461-1944. CLAUDE MOORE COLONIAL FARM -- Wednesday through Sunday, 10 to 4:30, 6310 Old Georgetown Pike, McLean. Observe a farmer's family performing 18th-century agricultural and domestic activities. Adults $1; children under 12, 50 cents. 703/442-7557. ANACOSTIA NEIGHBORHOOD MUSEUM -- Friday 10 to 6; Saturday and Sunday, 1 to 6, 2405 Martin Luther King Jr. Ave. SE. Afro- American history lectures to ages four through eight as well as group tours and teaching services. 287-3369. BREAKDANCE CONTEST -- Friday, 6, John E. Howard Community Center, 4400 Shell St., Capitol Heights, Maryland. The Maryland-National Capital Park and Planning Commission will sponsor this Breakdancing and Popping Contest. Entry fee, $5 per group, admission $1 per person. 735-3340. PUPPET SHOW & STORYTELLING -- Saturday, 10:30 to 11:30, Great Falls Grange, 9818 Georgetown Pike, Great Falls, Virginia. Puppeteer and storyteller Jeanne Leckert will tell stories and present "Snow," an original puppet show. 759-6037 or 281-1968. SATURDAY MOVIES -- Saturday, 11, Alexandria Library, Burke Branch, 4701 Seminary Rd., Alexandria. "P.J. and the President's Son," the son of the president and the son of poor parents meet and discover that the grass isn't always greener on the other side of the fence. "Ben and Me," the story of Amos the mouse and his adventures as Benjamin Franklin's adviser. 838-4598. CHILDREN'S RADIO THEATER -- Saturday, 8 a.m., WPFW 89.3 FM. "Silent Water," a girl learns that her deafness can be an advantage when a classmate's life is in danger. Listeners can participate in a call-in following each program by calling 783-3104. BIRDWALKS ON ROOSEVELT ISLAND -- Saturday and Sunday, 8:30, Roosevelt Island Parking Lot, by the bridge, George Washington Parkway (northbound side only). Bring binoculars, wear subdued clothing and learn what birds look like and how they sound. Reservations required. 285-2598. SATURDAY MORNING AT THE NATIONAL -- Saturday, 9:30 and 11, Helen Hayes Gallery, National Theater. You can join flamenco dancer Ana Martinez, guitarist and vocalist Paco de Malaga and narrator Irina Montez for some Spanish dancing and music. Reservations recommended. 783-3370. MUSEUM OF AFRICAN ART -- Saturday, 10 and 12:30, 318 A St. NE. At 10 a.m., children ages five o eight can make a small leopard head using clay and brass paper fasteners after hearing a folktale about a king and leopard. At 12:30 children of all ages can hear African folktales presented by museum ocents.287-3490. KIDS CRAFTS -- Sunday, 2 to 3:30, 8940 Jones Mill Rd., Chevy Chase. The Audubon Naturalist Society will sponsor a hands-on- crafts program, "Making Straw Ornaments and Leaf Collages." 652-9188.