For one hour, on just one night, I'd not be bothered, esp. with it ending by midnight. If it was a night after night thing for the duration of the cruise, perhaps. I have never seen party after party late at night on any of my Celebrity cruises. Not all Celebrity cruises have these sparkle or white night parties on deck anyway, my understanding is they are fairly infrequent. Just because I decided to "stay for a while" which would have been after 11, then decided to retire to my room, doesn't mean every other guest has to do the same. At the end of the day, it concluded by midnight not 2:00 in the morning.