OPERA America has received a five-year, $5 million grant from the Lila Wallace-Readers Digest Fund to support the development, commissioning and production of new works, and help those works to reach new audiences. The program will begin immediately, with the first grants to be awarded this summer, according to OPERA America president Ardis Krainik. Companies may apply in six categories for grants ranging from $500 to $150,000, with a $350,000 limit per company.

- AS ITS CONTRIBUTION to the San Francisco summer festival, "Mozart & His Time" (May 22-June 30) the San Francisco Opera will present 21 performances of Mozart operas during the month of June in the War Memorial Opera House.Operas to be seen are "The Magic Flute," "The Marriage of Figaro," "Cosi fan tutte" designed and directed by Harry Kupfer of the East Berlin Komische Oper, and "Lucio Silla" in concert form, also "La Finta Giardiniera" on June 30 in Stern Grove. Among stars engaged for the season are Ruth Ann Swenson, Luciana Serra, Jerry Hadley, Frederica von Stade and Judith Forst.

- THE SAN FRANCISCO BALLET will tour to St. Louis for three performances Sept. 27-28 and then to New York's City Center for seven performances Oct. 1-6. . . . The Margaret Jenkins Dance Company of San Francisco will have a one-week season at New York's Joyce Theater March 12-17. Also scheduled are dates in Ghent, Belgium, in May and at Jacob's Pillow in Lee, Mass., in July. In November 1990 Jenkins took her company to the Soviet Union for performances in Leningrad, Vilnius and Moscow.

- MOSCOW'S BOLSHOI THEATER will return to the United States in June for the first time in 16 years, performing at New York's Metropolitan Opera House and at Wolf Trap Farm Park in Virginia. Making the trip are soloists and chorus of the company, plus the full Bolshoi Theater Orchestra and Bolshoi Ballet - 450 in all.

Scheduled are a new production of Tchaikovsky's "Eugene Onegin," Rimsky-Korsakov's opera-ballet "Mlada," never before seen in America, and Tchaikovsky's "The Maid of Orleans," a New York premiere.