Festival de Viņa del Mar 1981
Ray Conniff was a member of the jury with Maureen McGovern, among others. He conducted the festival orchestra and chorus. The chorus consisted of 4 men and 4 girls.
Found these two clips from a compilation DVD but it appears that Ray performed at least one more track. Screenshots are shown below.
Partial track lof Ray Conniff segment:
Ray Conniff conducting