The GHK emailed me to find out if they could do anything to help me prepare for my visit. I wrote back to see if they could add the night that I'm added as an additional guest (purchased on DDF, but I didn't tell her that!) to my reservation so we don't have to worry about checking out and checking back. She wrote back "I have taken care of it for you. You will be in the same room for the 3 nights."
It sounds like I'm all set ... It'll be great if I don't have to worry about doing anything more once I get there!