When I called about adding tickets to a Kids stay, play and dine promotion reservation the CM I got said that the promotion period would have ended by then so that the current prices when I checked in would be what I paid and she couldn't guarantee that the kids tickets would be free if I added days to them later. I would think it would be the same for adding days as well...but not sure. I just went ahead and added the days to their tickets now....I mean I could add 10 days and they'd be free LOL, the only one paying for tickets in that room would be me.