Five people standing on a stage, getting ready to perform, who are unrecognizable due to the lack of lighting.
The audience watches as the actors in the dim haze, ready their lines for the first scene.
Actors perform in a stage regardless of if an audience watches or not, it's a rehearsal.
The audience may not be watching the actors perform or about to perform their first scene.
The five people may be actors or they may be musicians or many other types of performers.  The five people may be getting ready with their lines or they may be getting ready in other ways.  This may not be before the first scene as there are a number of scenes or acts in a performance or it may not be acting at all so it may be intermission.