To dream that we are being exhibited probably means that our spiritual identity is being questioned. When we are at an exhibition we are being presented with new ideas.
Psychological / emotional perspective: Psychologically we do not appreciate being inspected like an exhibit, so this type of dream may show some disquiet about the way people regard us.
Material aspects: An exhibition hall tends to be a place where similar objects are grouped together, so from a mundane perspective would denote such a situation in working life, possibly uncovering a difficulty with being managed too closely. Consult the entry for exam / being examined for further clarification.