Hi Kimberley!
Thank you for visiting the Moms Panel!
I am excited that you are planning for your first trip to Walt Disney World Resort, and there is so much to find out, and plan for, please come back and ask us any more questions you may have - we would all love to help you plan your first magical vacation!
Mickey's Very Merry Christmas Party is a special, fun event at Magic Kingdom park, which the whole family would enjoy. This year, unfortunately, the last party date is December 21st, so I am sorry you will not be able to experience this.
The whole of Walt Disney World will be adorned with the most beautiful Christmas decorations, so every day feels like a Christmas party, and as you are staying at a Disney Resort, you are entitled to use the Extra Magic Hours (only available to Disney Resort Guests) when you can enter the park before the official opening times, or stay after the park has closed. This is only available on select days, and the best way to check for during the dates of your visit is by looking at the Park Calendars. I have put the links below:
Magic Kingdom Epcot Hollywood Studios Animal Kingdom
Please remember to change the month, in the top-right corner, to December.
Don't forget to ask us any more questions about your first magical trip to Walt Disney World Resort!