While the above may be true, I've noticed in the many times I've been lately, that *every* CM is different. I suggest that to be best prepared, you take multiple copies of the printed quests. The pdfs are different as they are one use only so you'd need one per ticket to redeem for the nemo chair, the gold collection (hidden mickey), the tent, etc.
As far as the holiday quest. We went last week to 2 of the Christmas Parties. In addition to our AP's we had 2 party tickets. On the first night, we had no problems redeeming our quests off of the party ticket. On the second party night, only 2 of the 3 members of the party were allowed -- it was lame because the same CM did all of us at the same time. Anyway. Just be prepared for whatever transpires. There really is no consistent policy. There was no issue in redeeming the quests on our APs.
Keep in mind, on
MVMCP nights, MK closes at 6 pm. You can 'enter' MK as early as 4 pm on the party ticket, however, so that is probably the earliest you can safely use the party ticket for the quests. Also, VMK is not open during MVMCP, so, do what you need to do by 6 pm on those nights.
Have a *wonderful* time. I have to say, the fireworks for the MVMCP are easily the best I've ever seen. Try to stand on Main Street, somewhere around Casey's so you'll be able to best see the fireworks behind the castle and the perimeter fireworks. Don't stand in the Hub as the castle hides some of the fireworks.