I'm assuming one of you is on the 2017 sailing and the other is on the 2018. The OP is just hoping that pirate night will be on the 24, she didn't say that it is, so what you see on the navigator's should be correct, unless they decide to change it for your sailing. We did the West. Car. last Jan and pirate night was the same day as Cozumel, our's wasn't a Merrytime cruise though and it was on the Fantasy.