Ah, October. The month where my husband spends his free time trying to scare me with bits of fake blood and various masks and it all culminates in a costume party that really is rather spectacular.
Is Halloween even a thing in the 23rd Century? I doubt it'd be the American version that I know involving kids, candy, and dressing up given the lack of kids on the ship.
(Private to Castle/Morale Team) I did have an idea for an event you could all hold, though not necessarily for Halloween. A murder mystery party. Castle's quite good at killing people on paper.