The National Symphony Orchestra announced yesterday that it will play its major summer series at Wolf Trap Farm Park, starting next summer.

Mrs. Jouett Shouse, chairman of the Wolf Trap executive committee said, "We plan to give the Washington public a series of concerts of the highest quality featuring world famous soloists and conductors."

Mstislav Rostropovich, in his first year as music director of the orchestra, will conduct four of the Wolf Trap concerts in August. He will also serve as the orchestra's music director for the series.

David Lloyd Kreeger, president of the National Symphony Orchestra Association, said of the move, "The National Symphony is extremely pleased to be at Wolf Trap. We feel now that with these two splendid concert environments, Wolf Trap and the Kennedy Center, that the National Symphony can serve its public in the best possible way."

Rostropovich's first concerts with the National Symphony in his new role as music director will be the Tuesday-Wednesday-Thursday subscription concerts in the Kennedy Center on Oct. 4, 5 and 6. With Rudolf Serkin as soloist in the Beethoven Fourth Piano Concerto, the evening will open with Weber's "Oberon" Overture and conclude with the Seventh Symphony of Dvorak.

Members of the Rostropovich Fan Club will have a chance to meet the conductor on Saturday, Oct. 1, between 12:30 and 2 p.m. when he will be at the Discount Record Shop to meet his friends and autograph copies of his Angel recordings.

On the orchestra's financial front, Kreeger announced recently that the NSO has raised the first $500,000 of the $3 million required to fulfill the terms of a recent National Endowment for the Arts challenge grant. The deadline for the first phase was Aug. 15. There is still $2.5 million to go for the 3-to-1 grant.

OPENINGS: The National Gallery of Art will open its 36th season of free Sunday evening concerts Sunday at 7 p.m. Richard Bales, heading into his 35th year of directing the Gallery concerts, will conduct the world premiere of Randall Faust's Concerto for Brass, Percussion, and Strings, written especially for the Gallery. The program, which will begin with a Chamber Symphony by Shostakovich, will close with the "Chinese Flute" by Ernst Toch, with soloists Martha Steiger and William Montgomery.

Isaac Stern will play a violin recital in the Kennedy Center on Friday to mark the opening of the various series of the Washington Performing Arts Society. His program includes two of the Brahms sonatas, a Schubert Sonatina, and pieces by Kreisler and Szymanowski.

Michael Lindstrom, newly appointed assistant orgainst of the National Presbyterian Church, will play a free concert in that church Sunday at 3 p.m. The music will be by Reger, Clerambault, Bach, Dupre, Messiaen and Persichetti.

Reps. John Brademas, (D-Ind.) and Frank Thompson (D-N.J.) and Sen. Claiborne Pell (D-R.I.) are introducing legislation calling for a White House conference on the arts in 1979. Longtime champions of legislation on behalf of the arts in both houses of Congress, the three men realize the need for continuing support and interest "at the top." Brademas said, "A White House conference on the arts would give concerned persons from the arts, business, labor, foundations and government at every level the opportunity to exchange ideas and propose new solutions to these issues." Amen, brother.