I emailed my
DCL contact again and this was his response....
As of now we are showing the dining rotation as:
"Night # 2 - Formal night
Night # 4 - Pirate night
Night # 6 - Semi Formal night
Please keep in mind that this can change at any time by the ships discression"
When I spoke to DCL prior to making my reservation, they indicated that there would most likely be some type of "event" on Halloween night for the cruise...she said that it is up to the crew on board, but there is usually some of type of costume party and trick-or-treat stations set up around the ship.