When the curtains open

The crossword clue “When the curtains open, is ACTI?” is asking for the answer to the question of when Act I, the first part of a dramatic or musical work, begins. Typically, Act I begins immediately after the curtains are opened, which signals the start of the performance. This is often accompanied by an overture or musical introduction and sets the stage for the story to unfold. In a musical, Act I usually ends with a big production number or showstopper, leaving the audience excited for the rest of the show. Overall, Act I is a crucial part of any performance and sets the tone for the rest of the production.