CLASSICAL MUSIC

Fans of bel canto opera have two events to sample this week. The Summer Opera Theater Company is presenting Donizetti's "Roberto Devereux" at Catholic University's Hartke Theatre. This week's performances are Monday, Wednesday and Friday evenings. And the Wolf Trap Opera Company will present Rossini's "L'Italiana in Algeri" Wednesday and Friday evenings at the Barns of Wolf Trap.

This afternoon the Glasgow Phoenix Choir will appear at the National Presbyterian Church and organist Jim Welch will perform at the Washington Cathedral.

On Tuesday evening, the ensemble Hesperus will appear at the Washington Cathedral and on Wednesday evening the National Arts Trio will be at George Washington University's Lisner Auditorium.

Venezuelan conductor Fernando G. Zavarce will conduct the D.C. Youth Orchestra Friday evening at Coolidge High School. DANCE

Dancer-choreographers Maria Costello and Lee Richmond present a program of their works at Dance Place this evening. Moscow's famed Bolshoi Ballet performs two full-length ballets at Wolf Trap this week: artistic director Yuri Grigorovich's "Ivan the Terrible," with its notable Prokofiev score, Tuesday through Thursday evenings; and "Giselle," Friday through Sunday evenings. At Dance Place Saturday night, the Pola Nirenska Company presents an evening of choreography by Nirenska, one of the great pioneers of Washington dance, who is celebrating her 80th birthday. The program features a tetralogy of works relating to Nirenska's experiences as a Polish-born Jew who was a refugee from Nazi Germany, and the premiere of a solo created for guest artist Rima Faber.

FILM

Flicks for free! The audiovisual division of the D.C. Public Library is presenting a traveling film series, "Local Films, Local Filmmakers -- D.C. on Camera," at selected libraries through Sept. 24. Among the highlights: "The Stonecarvers," an Academy Award winner by Paul Wagner and Majorie Hunt about the the craftsmen who worked on the Washington Cathedral; "Promises to Keep," about Mitch Snyder and the Community for Creative Non-Violence; and "Fine Food, Fine Pastry. Open 6 to 9," about Sherrill's Bakery on Capitol Hill. Call 727-1331 for more information and schedules.

At the University of the District of Columbia's Black Film Institute, "Hot Nights, Hot Sounds -- Black Music on Film" runs Wednesday through Aug. 13. "A Night in Havana: Dizzy Gillespie in Cuba" and "Gospel According to Al Green" are two presentations. Lectures and panel discussions will follow selected films. Call 727-2396 for more information. POP MUSIC

The French invasion continues at the Bayou (French word, of course): it's female rocker Guesch Patti and Encore on Sunday, the world-funker Mano Negra on Monday.