To dream that you are at the carnival signifies deceit and misrepresentation. If you are watching 'freak shows' then you have a lack of peace and fulfillment within your home life. Sadness will be coming to parts of your life that were once happy and content.
To dream about being on a carnival ride indicates that you are traveling in loops. It could also represent simple enjoyment; the kind that leave no lasting impression.
To dream that you have run away with a carnival represents that you will have close ties or will be involved with the entertainment industry in some manner.