When you are mourning in a dream, then such dream indicates how you are holding on the past. Perhaps you should make some new space for the future in your heart and your mind. If you are wearing the mourning, then such dream symbolizes losses, sadness and misfortune. If you saw other people wearing the mourning, then such dream shows the unpleasant experiences for those that are close to you such as your friends and relatives.
Read more about dreaming of Mourning in other dream meanings interpretations.