This short documentary features Canadian contralto Maureen Forrester as she sings at the Festival Casals, a musical event founded by the great Spanish cellist and conductor Pablo Casals and sponsored annually by the Puerto Rican government. Part concert film, part tourism film, Festival in Puerto Rico offers viewers candid glimpses of mid-20th century Puerto Rico intercut with performance footage of Forrester and her husband, violinist-conductor Eugene Kash.
| Actor | Role |
|---|---|
 Maureen ForresterHerself | Herself |
| EEugene KashHimself | Himself |
| AAlexander SchneiderHimself | Himself |
| PPablo CasalsHimself | Himself |