Folksinger Bob Gibson beside appearing Sunday night with Guy Clark, songwriter Steve Gillette and others (see page 3) at the Kennedy Center's open house -- also plays the Birchmere Wednesday night with Gillette (seats are $8.50; 549-5919).

Gillette is also keeping busy: He'll be part of Dick Cerri's Music Americana showcase Tuesday night at the Birchmere (along with folk veteran Eric Anderson, New Yorker Rod MacDonald and D.C.'s own Side by Side; $6). Then Gillette, writer of the classic "Darcy Farrow," (his songs have been recorded by John Denver, Gordon Lightfoot and his friend Linda Ronstadt), will conduct a songwriters' workshop at 2 p.m. next Saturday (June 28). Five bucks, collected at the door by co-sponsors the Songwriters Association of Washington and the World Folk Music Association, will get you into the Birchmere for this one. Call SAW at 734-8359. -- Roger Piantadosi. JOKE NEWS

What's funny? Two new comedy venues, maybe, and a couple of video twists.

The new weekday comedy "clubs," both offering at least three mostly local comics on separate weeknights -- with no cover charge -- are: The Polo Club at the Bethesda Hyatt Regency on Wednesday nights (free parking for patrons, plus Metro is also downstairs), and J.W. Gaither's in Gaithersburg on Monday nights.

As for TV, you might just see some of D.C.'s funnier folks on Just Funnin', a monthly half hour from the Channel 9 producers who brought you "Music Video Connection." (The premiere, tonight at 11:30, features, among others: Gregory Poole and Tomorrow's Comedy, Bill King and music by local popsters the Bulldogs). The other video connection involves the camera crews you may have noticed in recent weeks at the Comedy Cafe on K Street: they're from a Rockville production outfit called Entertainment Today & Tomorrow, which is putting together a "Best of Washington" video compilation. The tape will be available through Erol's, says ET&T vice president Dennis Bertsch, who hopes eventually to syndicate the package on cable. -- R.P.