To dream of an evacuation indicates that you are separating yourself from others and suppressing your emotions.
To dream that you are in a town that has been evacuated suggests that you believe that others have forsaken you. You don’t feel as though you belong.
[1]1. Inability to move in one’s dream signifies an inability to let one’s emotions go.
2. Being in an empty town indicates one has a feeling that he/she will be deserted.
[2]