Hearing a gong in a dream can mean that you need to pay attention to something important that is happening in your life. You may have been ignoring an important issue because it is too difficult or painful to acknowledge it.
A gong is often sounded at the end of a section of music or to signify the end of a round of physical activity, so a gong in a dream can represent the end of a phase in your life.
If you dream that you hear a gong, it can be a message that you need to change the way in which you are approaching a situation. You can no longer continue to do the things the way you were doing them previously.
A dream that you are striking a gong can mean that you want your achievements to be recognized.
Striking a gong in a dream can mean that you must use your inner strength in order to make things happen.