To dream that you are at the carnival represents falsehoods and deception. If you observe freakish sights, then it denotes a lack of harmony in your domestic life. Much sorrow will arise in what were thought to be pleasant times.
To dream that you are on a carnival ride suggests that you are going in circles. It may also symbolise cheap thrills.
To dream that you run away with the carnival denotes that you will be involved in or closely connected to the entertainment field.