Ok. I'm a dummy...in so many ways.
My first mistake was not entering the class into my calendar (Outlook) the moment I registered. I remembered that it was this weekend, and when I didn't see see it on the calendar, I entered it (from memory - you may see where this is going). Yesterday, I printed the ticket and put it in my purse. Today, I went to class. When I got there and started unloading the car, I found out that they had moved. So I put everything back in the car and hustled off across town to the address PRINTED ON THE TICKET. I arrived late. Only to find out that I was a day earlier than the date PRINTED ON THE TICKET. D'oh!
They were very nice about it and I unloaded my car and left everything there, so on the up-side, everything is ready for tomorrow.
