Hi Andreia,
Disney World is the perfect place to kick off the holiday season with festive events, delicious specialty-themed foods, and decorations galore. You picked a perfect week to visit because that timing often falls before the holiday crowds have kicked into full gear.
All of the days you mentioned should be clear for a nice day at Magic Kingdom. Weekends always tend to be a little busier because there is more local traffic, so I tend to choose a weekday to visit Magic Kingdom if I can. I like to try to plan my Magic Kingdom day around whether or not I will be attending
Mickey's Very Merry Christmas Party during the holiday season. On days that the party is happening, Magic Kingdom seems to be a bit less busy, but the theme park will close at 6 PM to guests using regular admission tickets. Party guests will start to arrive at 4 PM, so the park will also get significantly more crowded from 4 PM until you are required to leave at 6 PM. I like to visit
Magic Kingdom on the day without a scheduled party, so I have much more time to try and hit all of my must-do experiences.
If you are open to purchasing another ticket, Mickey's Very Merry Christmas Party is an amazing experience with a holiday parade, snow on Main Street, and tons of unique character experiences. They also sell a limited number of tickets, so the waits for rides are significantly shorter.
Unfortunately,
Bibbidy Bobbidi Boutique does book up very quickly after the booking window opens. This is a hard reservation to get, but if you are persistent, sometimes you can snag a reservation that someone else has to cancel. I randomly check for my date range once a day leading up to my vacation to see if something opened up. You can also check for the possibility of same-day reservations when you arrive. These are super limited but if you go straight to Bibbidi Bobbidi Boutique as soon as Magic Kingdom Park opens you may be able to snag one.
Happy Planning,
Jenna