OPEN HOUSE IS INSIDE/OUT AT KENNEDY CENTER

The third annual "Inside/Out" open house turns the Kennedy Center upside/down noon to 7 Sunday with more than 70 entertainers and groups performing free. Besides such emerging artists as soprano Cheri Reiser and pianist Christopher Harding, the open house features Sweet Honey in the Rock, country music's Patsy Montana with Cathy Fink & Rhythm Ranch, singer Mary Chapin Carpenter, the Blues Alley Youth Orchestra, National Symphony Orchestra Ensemble, D.C Contemporary Dance Theater and "rockappella" group Betty. Four of the five Kennedy Center theaters will be open for tours from noon to 5. Free. 254-3600.

REST OF THE BEST

The 289th annual Fred- ericksburg Dog Mart is 10 to 3 Saturday at the Izaak Walton League Park. Take the Rte. 3 west exit off I-95, go 10 miles and watch for the signs. $3. 703/373-9246 . . . Schifferstadt Museum's Oktoberfest is 10 to 5 Saturday and Sunday with 75 juried craftspeople, German dancers, bratwurst, knockwurst and German beer. Free at 1110 Rosemont Ave. in Frederick. 301/663-8687 . . . the Maryland Honey Festival is 10 to 5 Saturday and noon to 5 Sunday at the Oregon Ridge Nature Center, 13555 Beaver Dam Rd. in Cockeysville with tastings, mead-making and those folks who wear bee-beards. Free. 703/771-0034 . . . the Capital Women's Ruggerfest is 9 to 6 Saturday and 10 to 3 Sunday with 16 teams battling on the fields east of the Lincoln Memorial. 265-6120.

TWO FOR THE MUSIC

The blues ain't so bad, at least not when they're at the Blue Bayou Music Festival (see page 19 for related record reviews) noon to 8 Saturday at the Prince George's Equestrian Center in Upper Marlboro. Rock 'n' roll, R&B, cajun and doo-wop can be heard by such notables as the Nighthawks, Tex Rubinowitz, Sun Rhythm Section, Orioles and Noble "Thin Man" Watts. Tickets are $8 at TicketCenter (432-0200), $10 at the gate. Maryland seafood and barbeque will be for sale. 952-4740.

Combining African traditions and contemporary innovations, jazz composer George Russell and the Living Time Orchestra make a rare Washington appearance at 8 Friday in the Baird auditorium of the Museum of Natural History, 10th and Constitution. Tickets are $12 at the door. Call 357-3030 for information.

LIGHT MOVES

The Kei Takei Moving Earth dance troupe moves its epic "Light" to the Dance Place this weekend, (see page 7) but they'll be performing free excerpts 6 to 8 Friday on the north side of the Washington Monument; at 6 next Thursday and Friday (October 8 and 9) at the Washington Monument; and at 9 Thursday (October 8) at Washington Harbour, 3000 K NW (rain date October 9). 269-1600.

KIDS KORNER

"Barnstorm!", Wolf Trap's fall children's series, starts its new season with shows at 11 and 1 Saturday featuring Michael Shwedick and his entourage of friends from Reptile World. Kids can see -- or pet -- a 15-foot Indian python, a green iguana, a crocodile and alligators, among other warmly regarded cold-blooded creatures. Tickets are $4. Call 938-2404.

Kinderfest at Watkins Regional Park (301 Watkins Park Dr. in Upper Marlboro) is noon to 5 Sunday with carnival games, train rides, face painting and children's theater. Free. 249-9220.

FESTIVAL WRAPUP

If you don't believe fall's here, peruse this autumn festival list:

The Waterford Craft Fair, one of Virginia's oldest, is 10 to 5 Friday through Sunday. Throughout, you can learn how to clog with the Fiddler Puppet Cloggers, watch the Mill Run Dulcimer Band make dulcimers as well as music, see the handiwork of more than a hundred crafters and tour 10 19th-century homes. It's $8 at the gate, under 12 free, three miles west of Leesburg, off Rte. 9. 703/882-3018.

There's a streetfest in Old Town Manassas 10 to 4 Saturday with performances by the Rainbow Theater for Children, balloon rides ($2), locomotive and caboose tours and more than 80 booths with crafts and food. Free. 703/361-6599.

Brandywine's two-day Craft Fair boasts 150 artists 11 to 6 Saturday and Sunday at the Curtis Farm at U.S. 301 and Cedarville Road. Spread over 50 acres will be craft demonstrations (including pottery, basket-making and wood working) and plenty of country-style foods. It's $3, $2 for seniors; under 12 free with an adult. 899-0883.

The third annual Artists of the Blue Ridge Show joins the Sperryville Apple Festival for a crafty show with great tastes, 10 to 6 Saturday and Sunday in the Old Town section of Sperryville. Besides the work of 40 artisans and magic shows, there'll be bushels of apples, pies, jams and more for sale. Sperryville is at the intersection of U.S. 211 and U.S. 522 in Virginia. 703/987-8521.

OUT OF THE PAST

The fourth annual Black Memorabilia Show is 11 to 8 Saturday and noon to 6 Sunday at the Silver Spring Armory, 925 Wayne Ave. The show brings back pleasant and not- so-pleasant memories that include books, toys, kitchen items, sculpture and folk art. It's $3.50, under 12 free. 559-6363.

TAPPIN' AROUND

The National Theater continues its free Saturday morning children's program with tap-dancer Scott Michaels demonstrating wide-ranging dances from African and vaudevillian dance to cakewalks, soft-shoe, ballet and more at 9:30 and 11. There'll even be time for audience members to strut their stuff at the theater, 1321 Pennsylvania Ave. NW. Call 783-3372 for reservations.