(there's) no show without Punch

A particular event, performance, endeavor, etc., cannot be held or proceed as intended without the most important person or purpose. A reference to a Punch and Judy Show, a traditional puppet show starring Mr. Punch and his wife, Judy. The popular reality TV show announced that the fan-favorite host would be replaced in the next season. Many fans took to social media to voice their displeasure, stating that there's no show without Punch. Don't worry, you've got time. They won't start the presentation until the boss arrives—no show without Punch, after all! The board meeting got canceled because the chairman had a scheduling conflict, and there's no show with Punch, I guess.