I just got an automatic email from my credit card company saying a large purchase just posted. I took a look and it was a full prepayment of my stay at the Sheraton for Botcon. I called them up and they told me there shouldn't be any prepayment required, but they have to do an investigation with the Hotel's Accounting Department to see what happened. Never once was I told I would have to prepay the stay. I encourage EVERYONE to check their credit cards to see if they were charged in full early. My reservation was originally for May 30th to June 5th, so it's possible that charges may be trickling in.