THE WASHINGTON Shakespeare Theatre opens its production of Christopher Hampton's "Les Liaisons Dangereuses" on Saturday, which also happens to be Bastille Day. So the troupe will be serving cake after the 8 p.m. show, says artistic director T. J. Edwards (we're told that Marie Antoinette herself kept a secret copy of "Liaisons," the then-scandalous novel by Choderlos de Laclos).

The capable director is Jim Stone, who recently staged "The Well of Horniness," another naughty play, at Source; the solid cast includes Brian Hemmingsen, Megan Morgan, Nanna Ingvarsson and Nancy Robinette. "Les Liaisons" continues through Aug. 5 at the Black Box Theatre, on the Takoma Park campus of Montgomery College. Call 546-8585.

AT SOURCE'S 10th annual Washington Theatre Festival this week: Harry Bagdasian, founder of the late, great New Playwrights' Theatre, unveils his new play "The Night LBJ Died" on Monday at 8 at the Church Street Theatre -- which used to be NPT, of course. The play is based on a crisis at the theater circa 1973. Larry Redmond takes the night off from Studio's "Frankie and Johnny in the Clair de Lune" to play a character based on Bagdasian; theater lovers with long memories will recall Redmond played Bagdasian in Ernie Joselovitz's "Nicky and the Theatre for the New World," which also portrayed the creative but chaotic early days at NPT.

Also at the Festival, Roy Barber premieres his music theater piece "Children With Stones," which looks at the effects of the intifada uprising on both Israeli and Palestinian residents of the West Bank and Gaza. Barber, a Helen Hayes Award-nominated musical director and composer, spent two years interviewing and gathering material for the piece, which will run Monday through Wednesday at Source. Call 462-1073.

THEATER is kids' stuff, too, of course, and Library Theatre fills the bill. The troupe's bringing its "Storybook Express," featuring original adaptations of three classic children's stories, to D.C. libraries through Aug. 6. It's the 10th year for the troupe's reading awareness program -- last year more than 5,600 kids participated. The company has updated "The Greedy Old Fat Man"; "The Tale of Woo and Hoo," based on a Japanese folk tale; and "Happy, Ever, After," based on a tale by the Brothers Grimm.

All performances are at 10:30, and you can catch it this Friday at the Cleveland Park Branch (Connecticut and Macomb NW) and Monday at Woodridge Regional (Rhode Island Avenue and 18th Street NE), Tuesday at Parklands-Turner (Alabama Avenue and Stanton Road SE), Wednesday at Takoma Park Branch (Fifth and Cedar Streets NW) and Thursday at Francis Gregory Regional Branch (Alabama Avenue and 37th Street SE). Call 291-4800 for further schedule information.