To dream that you are in front of an audience represents the world around you and how it is paying close attention to your actions. Alternatively, it signifies your fears of having your personal feelings and private thoughts discovered or revealed. If the audience is rowdy or noisy, then it suggests cluttered thoughts and confusion of ideas.
To dream that you have no audience denotes that you are not being acknowledged for your work or achievements. Perhaps you are feeling ignored or neglected.
Dreaming that you are the only person in the audience means that there is an important lesson that you and only you need to learn. Perhaps you have been oblivious to something that everyone else had already realized or notice.