I questioned Hobbystar about the "A" gold tickets, as I promised I would and got this response from the second-in-command.
"The "A" was written on the back on tickets that had been bought in advance of the Expo, those folks should get in first. We are trying to avoid people lining up ahead of scheduled events, but it didn't work, so back to the drawing board. Thanks.
Now we all know it didn't work out that way. I wrote him back that people who had gotten their tickets online the first day they were available hadn't gotten the favored mark, and I have put off posting this waiting for a reply. But I guess he has no intention of further answering this.