There will be pirate photos displayed on the wall during pirate night. If you are in animators on the Dream or Fantasy, you will not have animation magic. Instead you will have Turtle talk with Crush during AP.
I did a 5 night Dream. Two of the restaurants we ended up in twice and the other only once. The cruise had pirate night for one menu and then a random menu for all dining rooms the other night.
Generally, each dining room has it's own menu they serve once during the cruise. The other 2 nights the menu is the same in all dining rooms (different than the Signature menus). One of those nights will be the Pirate night menu. I'm not sure what the other one is, but it'll be the same in all dining rooms.
4 nights: Standard menu in each restaurant + pirates. On some occasions, you may get a special themed menu instead of pirates (holiday or themed cruise)
5 nights: Standard menu in each restaurant + Let the Magic Begin + Pirates. One of these may be replaced by a holiday or themed menu)
6 nights: Probably the most unpredictable: I have seen rotation 1 and rotation 2 menus in each restaurant or rotation 1 + special menus. This last approach is most likely if there is a holiday while on board with a special menu, or as part of a themed cruise with a special menu
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