The OP pretty much said it in his post...he has unused tix for a date that has passed. A number of shows will still honor the tix with some restrictions. Those are usually: not arranged in advance, a weekday performance, and with little regard to your original seat assignment.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.