I know people have mentioned that occasionally in the past they have gotten a huge amount of pixie dust and were upgraded to CL when checking in. Although I am not expecting that, I am wondering if there is availability, can you upgrade at that point and if so, would it be full price? Has anyone done this. I am thrilled to try the Boardwalk on our trip in a few weeks and have been reading all about CL and sort of wish I had just splurged and booked that yet now it is not showing availabililty. Any thoughts?