To see or sit on bleachers in a dream represents your awareness of a confrontation of some sort. You may be noticing yourself struggling with a problem. You may also be reflecting on the progress of your goals. A spectator view of a confrontation or struggle.
Negatively, dreaming about bleachers may reflect feelings about being powerless to be involved in a conflict or struggle. You can only observe others confront their troubles. It may also reflect enjoying a spectators view of two jealous people. Vanity of yourself confronting a challenge that is public.
Alternatively, bleachers may represent a struggle or confrontation you are witnessing with someone else.
To dream of sitting on empty may reflect your anticipation of a power struggle or confrontation with a problem. It may also symbolize your belief that other people are not interested in confronting a problem.
Example: A woman dreamed of standing beside in a school gymnasium. In waking life her felt powerless to help her son with a serious legal problem while hoping for the best. The bleachers in this case may have reflected her feelings about having a spectator view of the situation with her son while being powerless to do anything to help him accept hope for best.