There is no good excuse- except for an emergency. You do not fall into that category .
If you choose to have a hearing, I highly recommend that you choose to tell the truth. I hope you weren't really hoping that an attorney would help you prepare perjured testimony. If we did that, we could lose our license to practice. If you followed such a cooked up excuse you would have committed a far more serious offense and would have lost any chance for consideration on the parking ticket.
I agree with the other attorneys, although I do wonder why your question also says blubber. I'd like to add that I have represented somebody in the past with the same charges who did legitimately have a medical condition. They were able to subsequently get a valid handicap pass and I was able to get the charges dismissed. Good luck.