What is typically a part of stage building?

Constructing physical structures that support the production is an essential part of stage building, as it directly involves the creation and assembly of the stage itself, as well as any set pieces, backdrops, and other elements necessary for the performance. This task includes using various materials and tools to ensure that the performance area is safe, functional, and aesthetically pleasing to complement the artistic vision of the production. The physical structures are foundational to the staging and help actors, props, and scenery to be effectively integrated during performances, thereby enhancing the overall viewer experience.

The other options, while related to the theater production process, do not pertain directly to the act of stage building itself. Seating arrangements, promotional materials, and scheduling audience arrivals focus more on logistics and marketing rather than the physical construction and design aspects critical to stagecraft.