At the beginning of each academic year, the hall should determine whether or not to allow outside organizations to hang posters and advertisements in your hall. You probably wouldn't want to ban them altogether, however, you may want to limit the size or number depending on the availability of bulletin board space.
Posters are only to be posted on bulletin boards.
The housekeeping staff is instructed to remove all posters that are mounted in public areas other than on bulletin boards. Also, please assist by removing any outdated or unimportant materials.