An exhibition hall is a place for showing your work to the public. In dreams it is read as the wish for recognition, and as the nerves of being looked at and assessed.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.