CLASSICAL MUSIC

The Summer Chamber Music Festival continues this week at the Library of Congress, with concerts on Tuesday and Friday evenings and an open rehearsal at 11 a.m. Wednesday.

Itzhak Perlman is the National Symphony's guest artist (in the Mendelssohn Violin Concerto) Saturday night at Wolf Trap. The program will also include music of Mozart and Mussorgsky.

The Sixth Annual Conclave of the Southeastern Historical Keyboard Society will conclude today with the finals of two competitions: for composers, this afternoon at Mount Vernon College and for performers tonight in the Baird Auditorium.

Also worth noting: Pianist Mia Chung, tonight at the National Gallery; violinist Diane Monroe, this evening at the Renwick Gallery; a concert in honor of the 75th birthday of Alan Hovhaness, Friday night in the Departmental Auditorium; and a concert by the Gay Men's Chorus, Saturday night at the Kennedy Center.

DANCE

Washington Dance Directions '86: A Festival of Premieres, the third in an annual series of showcases for Washington's modern dance choreographers and companies, begins Thursday at the Marvin Theatre. This year, nine solo artists and companies will be participating, with three appearing each evening Thursday through Saturday, this week and next.

Feet First Jazz and Tap Dance Studio will celebrate the summer solstice with a free performance at the Sylvan Theatre (on the Washington Monument grounds, with lawn seating) Saturday afternoon (rain date Sunday).

The innovative Jazz Tap Ensemble from Los Angeles, exploring the traditions of jazz tap dance and its contemporary frontiers, will appear at Tawes Theatre Saturday evening as part of the University of Maryland's annual summer arts festival. FILM

The Joseph Mankiewicz series continues at the American Film Institute this week with "Suddenly Last Summer," "Guys and Dolls," "Sleuth," and Friday at 6:30, a must-see: "People Will Talk," starring Cary Grant in what he regarded as one of his best performances. A cult film waiting for a cult.

The American Satire series continues at the Library of Congress' Mary Pickford Theater with a new print of "First Lady," a 1937 Washington satire, Wednesday at 7:30; Friday at 7:30, Zemeckis and Gale's "Used Cars," one of the funniest, sleaziest satires of recent years.

The free Summer Cinema series continues at the National Theater tomorrow night with "The Blue Angel," starring Marlene Dietrich. Call 783-3372 for details.

The Sidwell Cinema at the Sidwell Friends school continues its summer film series today and tomorrow with "Burroughs," a documentary on the Beat generation novelist. Tuesday and Wednesday, Jim Jarmusch's hip '80s comedy, "Stranger Than Paradise." Call 537-8178 for details.

Next weekend at the Biograph: the Coen brothers' "Blood Simple," the best of the new films noir.

Thursday through Saturday at the Circle, two of last year's best films in a double bill: "Witness," starring Harrison Ford and Kelly McGillis, and "Prizzi's Honor," starring Jack Nicholson and Angelica Huston.

POP MUSIC

Benny Wallace, one of the fine young saxophone players, makes his Washington debut Monday at Blues Alley.

Emmylou Harris is the longtime home-town favorite, but at Wolf Trap on Wednesday, keep an ear on the opening act, Dwight Yoakam, the hottest hard-country newcomer since George Strait.

Boston's Bonnie Raitt loves Washington almost as much as it loves her: Last time she came solo and sold out the Warner; this time, she's got a hot band and she's at Wolf Trap, on Thursday.

Henry Threadgill and Fred Hopkins, two-thirds of Air, team up with percussionist Andrew Cyrille for some swirling vanguard jazz at d.c. space on Saturday.

Beausoleil, the toe-tapping, rhythmically intoxicating Cajun quintet, performs at the Birchmere on Saturday, and at Bethesda's American Legion Hall the following Sunday.

Bassist Wilbur Little, who worked in Washington in the '50s and '60s but has spent much of the last decade in Sweden, joins up with some other stellar Washington jazzmen -- Charlie Rouse, Billy Hart and Reuben Brown -- at Woodies Hilltop Pub on Saturday and Sunday.

THEATER

"Biloxi Blues" (at the National Theatre) is the second installment in Neil Simon's autobiographical trilogy, and it's every bit as entertaining as the first, "Brighton Beach Memoirs." Its hero, Eugene Morris Jerome, is now in the army, but he's learning more than just discipline. He's awakening to the wide world and his adventures are as funny as they are heart-warming.