"You'll manage rehearsals, actors, technicians, props and costume fittings, and liaise with front-of-house staff and the director. You'll need to have a good understanding of both the technical and artistic elements of a performance so you can ensure it is delivered exactly to the director's requirements."
So basically, a stage manager is like the manager of everything, it's an important job. You'll have to make sure everything is in order and that everything is how it's supposed to be, like the clothing, the place where people will be acting, etc.
For the Stage Manager in Our Town, I wouldn't know as I haven't read the bok.
B. Advocacy because theres no research and evidence
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Answer: No, it is not a run-on sentence</h3>
This is one full thought that doesn't run on for too long. The "overcome with joy" portion is the dependent clause that needs the other part "Mrs. Monroe told her husband the exciting news about her promotion" which is the independent clause. The independent clause could be its own sentence without the dependent clause, but not the other way around.