New prizes for new categories: The Walter W. Naumburg Foundation is presenting the first U.S. flute competiton. In May, 1978, flutists between the ages of 17 and 30 will compete for a top prize of $2,500, plus an Alice Tully Hall recital, all expenses paid, and a new work by George Rochberg, commissioned for the occasion. Second and third prizes will be $1,000 and $500. Details from the Naumburg Foundation, 144 West 66th St., New York City, 10023.

The University of Southern Colorado in Pueblo will sponsor a piano ensemble competition on April 9-10, 1978. This is not their first but their third, but the first to come to my attention. Category I is open to pianists under 30, with a prize of $1,500. Category II is for pianists between 14 and 18, with $700 prize.

In both categories, pianists will be required to play both four-hand music at one keyboard and music for two pianos. Details from Markowski and Cedrone, 2109 North Drive, Pueblo, Colo. 81008.

New prize, familiar category: The Beethoven Society is sponsoring a competition for opera singers on Oct. 1, 1977, for a top prize of $1,000, money for future study; second winner takes $500. Singers between 20 and 35 may write Mrs. Clarence Fisher, 5000 Klingle St. NW, Washington, D.C. 20016. Deadline: Sept. 24.

Speaking of contests: John Aler formerly a pupil of Rilla Mervine at Catholic University, recently won first prize - $2,500 plus public engagements - in the Concours International de Paris, AND first prize for singing French art songs. Aler is a Baltimore native, now living in New York.

Application are being accepted for the 14th session of Work-Experience Internships, a program conducted by the National Edowment for the Arts. The 13-week session begins on Feb. 14. Details from Kathleen Bannon, Administrator Intern Program, National Endowment for the Arts, Washington, D.C. 20506. Deadline: Oct. 7.

Important Changes in Location: Two major concert series have moved their series of operation: the Youth Concerts Foundation, which has presented outstanding young professional artists in recent seasons in Rockville, is moving its six programs to the Corcoran Gallery, where they will be given on Sundays at 3 p.m. The remaining concerts are on Nov. 6, Dec. 4, March 12, April 23, and May 7. Subscriptions for $20 to non-members, $15 for members.

The Corcoran will also house the programs of the Contemporary Music Forum, which is moving in from its longtime home in the Ethical Society auditorium on 16th Street. These are scheduled for Sept. 19, Oct. 17 and Nov. 21, with six more concerts to be announced later. These are free.

The 20th-Century Consort, for its third season, will move from last year's location to the Marvin Theater of G.W. University, with an opening program on Sept. 30. Later concerts are set for Dec. 9, Jan. 20, Mar. 17, and May 5. Details and subscriptions from the Consort, 901 C St. NE, Washington, D.C. 20002.

At noon on Wednesday, the subject for the National Town meeting at 10:30 a.m. in the Kennedy Center will be: The Relevance of the Arts in a Technological Society. Participants will include Sarah Caldwell, David Rockefeller, Rep. John Brademas, and Adm. Elmo Zumwalt.