I called yesterday to confirm my reservation - and I might have the same issue ("We are sorry - we can't find your reservation..").. Anyway - last year I stayed at the McDaniel House (
http://www.bnblist.com/md/mcdaniel/) - which was outstanding. You might want to give them a ring?? I'm not sure I can make it yet, so I'm not worried about the Holiday Inn and my reservation, as I don't think they charged anything to my CC (I need to check, though..?)
John