In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Hall
If you dream that you are inside a dark hall then you will be disappointed and will fail in some of your personal affairs. If you enter a hall then you will make a good acquaintance but if you are exiting a hall then you will lose the support of a friend.