Ask the CL CM at the CL desk up on the 7th floor when you check-in if there is a Rooftop Wishes viewing night available during your stay. You'll have to request it upon check-in since it can't be reserved in advance. I know the CL CMs will do their best to find a spot for you - good luck!
Is the rooftop wishes viewing experience significantly better than viewing it from a CL room on the 7th floor? Could you provide more details about the experience? Do you just go up there and stand there and watch or are there seats or anything?