Hi Karen!
Every once in a while certain Special Events and Tours have shorter reservation windows than others, because of changing schedules and accommodations for demand at busier times of year. Because of this, often the schedules are released later than 180 days out
(sometimes 120 days or even 90 days) once additional event times have been confirmed for the schedule.
During regular seasons, the
Pirates and Pals Fireworks Voyage operates Friday, Saturday, Sunday and Monday evenings. In peak seasons, extra evenings may be added to the schedule. The event will very likely continue to follow that schedule and would therefore indeed be running on Saturday December 8th, 2012.
Keep trying to call in for the reservation every week or so and you'll find it should likely open up soon for bookings. You'll just love the Pirates and Pals Fireworks Voyage and I can assure it's worth the wait to ensure you are able to get it booked for your family!
Wishing you a simply Magical time at Walt Disney World Karen!
Kirsten