Other than the first night exception, you won't be able to book Palo more than one time on the system. As others have said, if they have space, they might allow or offer another one. We were on a 7-night cruise a few years ago on the Magic and often went to the bar for a pre-dinner drink even when we weren't going to Palo for dinner and a couple of times we were offered space for dinner that night. We didn't take advantage since we wanted to go to the MDRs those nights, but it would have been available if we wanted.