Disney is closed on Christmas
If youcan afford it stay ondisney property that time of year. Or, Check with people that own condos there and rent from them
Tickets are available to purchase every day of the week. Be warned though on special events/ days ( like Christmas) the park fills up rather quickly. It is not unusual for Disney to "close" and not allow guests in when park is at capacity.
The park is open and tickets are available every day of the year. While it may close to new guests during a day due to becoming full that is rare and if you are there when it opens, it will be fine.
Last year they had a special event during Christmas
I am pretty sure they sell the tickets on the day, but better to buy it long before. Also make sure to install the magic kingdom's apps to get the latest info especially during holiday season. Like when I was there last November, which also the first day of christmas parade, but only for those who already had an extra wristband. So for those who didn't have must leave magic kingdom earlier.
Yes
Yes but there are special events that require tickets as well.
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