I like your analogy! Usually, mitochondria are compared to power plants. They are the power plants of the cell because they generate most of the cell’s ATP energy, adenosine triphophsate. Mitochondria are also used for signaling, cellular differentiation, cell growth and cell death.
Since the mitochondria provide the energy for the cell, and they signal growth and death, I would consider them the cell’s caterer. After all, a show runs on its stomach, right? If all of the actors are healthy and well fed, the show will be more successful. The caterer might also reward the performers with better food for better performance, which could be the cell growth.
If you don't like this analogy, my other idea was lighting. I like the caterer best though.