Zummi Gummi
Pioneering the Universe Within!
But, on these AH nights they are still offering the 50th fireworks to the day guests, with the holiday fireworks coming later (someone said 8:00 for Enchantment, 10-10:30 for Minnie's Holiday Fireworks or whatever it's called).Disney Tourist Blog lays out some fantastic reasons for why they had no choice but to do an event like this instead of the Christmas parties.
One of the best points he made is that you can't do a Christmas party throughout the 50th celebration. The 50th has it's own firework show so it's just not reasonable to kick people out of the park so frequently before the 50th fireworks happen that night. You can't tell guests to leave early because there's a Christmas party when so many are there for the 50th.