The stage manager is the person who has overall responsibility for backstage activities and the smooth execution of a production.
The Stage Manager has to work closely with the director, the set designer and lighting designer to ensure that the initial concept for the play is translated into reality on the stage.
It’s the stage manager’s job to organise the set building team – usually on a number of Saturdays leading up to the play. And during play week the stage manager is responsible for checking with the set, lights, sound and special effects people for any problems and iaising with props, costume and the actors to ensure that everything is running smoothly.
During the play the stage manager oversees prompt entrances by actors and usually spends the interval organising things for the next act! At the end of the run, the hall has to be cleared and left tidy for other users.