Pianist Kevin Kenner, a former finalist in the Gina Bachauer International Piano Competition and 1990 third-place winner in Moscow's Tchaikovsky Competition, adds another laurel to his crown - the Terence Judd Award of the Halle Concerts Society. The late-September adjudication entitles Kenner to a cash prize of 1,500 pounds, recitals in London's Wigmore Hall and Manchester, and performances with the Halle Orchestra.

- THE MARIAN ANDERSON International Vocal Arts Competition will be held for the first time in July 1991 at the University of Maryland, College Park. Named in honor of the famed contralto, it is open to singers ages 21-39, with $50,000 in cash prizes and prestigious engagements to be awarded. For information, call (301) 405-6540.The U. of Maryland's William Kapell Piano Competition will now become a biennial event, next taking place in 1992, with its 25th edition in 2000. The Vocal Arts Competition will be held every four years, alternating with the Leonard Rose International Cello Competition, which will be held for the first time in 1993.

- THE CAMBODIAN CLASSICAL DANCE COMPANY, now touring America, has been hard hit by defections. Three dancers defected in St. Paul, Minn., and a fourth in Lowell, Mass., while a fifth received death threats. Tour sponsors say the unrest results from Cambodian-Americans trying to undermine the troupe for political reasons.

The troupe is part of the government-controlled University of Fine Arts in Phnom Penh, which is trying to revive the 1,000-year-old dance form, all but destroyed by the Khmer Rouge. This tour marks the first artistic exchange between the United States and Cambodia since the Vietnam War.

Proeung Chhieng, 42, director of the company, had been a child star in the Cambodian Ballet. He survived the terror of the Khmer Rouge, which massacred about 3 million people, including Chhieng's parents, 12 of his brothers and sisters and most of his relatives.

- DANCE DIRECTORS, CHOREOGRAPHERS AND COMPANIES: Christopher d'Amboise, son of Jacques d'Amboise, has been appointed artistic director of the Pennsylvania Ballet. The 30-year-old dancer, formerly a New York City Ballet principal and choreographer, is also founder and director of a chamber group, Off Center Ballet. His new work, "Franklin Court," honoring the Benjamin Franklin Bicentennary, premiered on Sept. 12, opening P.B.'s 1990-91 season.

Merce Cunningham received the National Medal of Arts last month, prior to taking his company on its 27th tour of France in 26 years. India is also on the company's agenda . . . Martha Graham, 96, has surprised the dance world with a delightful new ragtime romp, "Maple Leaf Rag," choreographed to the Scott Joplin classic, in which she satirizes her own dance idiosyncracies. It's her 180th dance, part of her fall season in New York . . . Russian ballerina Galina Samsova will be guest director of the Scottish Ballet until January, when a new permanent artistic director will be announced . . . Peter Schaufuss, former Royal Danish Ballet principal who was fired last spring as artistic director of the English National Ballet, has accepted the artistic directorship of the Berlin Ballet.