I highly doubt there will be any halloween parties on your sailing since the cruise is over before halloween.
Halloween parties and parades onboard will take place on Halloween day.
Royal Caribbean goes all out on Halloween I'm sure Carnival, NCL and the others do too.
Have you thought of Doing a B2B?? That would add the Halloween cruise to the sailing you are booked on now....
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I too, have done LOTS of cruises over Halloween, and they've always had a party, and costume contest. LOTS of fun, and games. Only thing I was told they wouldn't allow, is ANY kind of weapon, plastic, wood or whatever, so leave those muskets, and swords at home.
Carnival most certainly does have Halloween parties for the adults and for the children. I've been on three Halloween cruises and they were so much fun (even purchased the video from one because several family members were in it). There was a parade of very inventive costumes through the ship, a costume contest in the lounge and parties in the disco and on the Lido deck. However, took place on Halloween.