Fit out the stage for theater productions.
A Theater Director is in charge of uniting the myriad parts that together create a play or musical. This includes both conceiving the primary artistic vision for the production, and orchestrating all production elements.
As a Theater Director, you begin each production by studying the script (consulting with the Playwright if possible) to ignite your creative interpretation of the work. Once you have your vision you meet with the assorted professionals who oversee lighting, costume, set design, and so on. Then you hire the cast and assist each Actor in discovering their character.
During rehearsals, each element of the production slowly comes together, and it is your job as Theater Director to perfect said elements to realize your artistic vision. To do this you spend most days holding rehearsals with the Actors, guiding them, taking suggestions from the production crew, and making changes along the way.
Breaking that process down into broad sweeps, it looks something like this: You first hold a read-through of the script. Then off-script rehearsals are performed. The last step before opening night is a technical rehearsal (scenery, lights, sound) and a dress rehearsal (costumes, makeup, wigs).
Once the show opens your job is essentially over, and you can sit back and dream of basking in the glory of (what will hopefully be) a deluge of glowing reviews.