Hey there Diego,
Welcome to planDisney and thank you for your question! I'm happy to hear that you're planning a trip to the Happiest Place on Earth early next year.
First, I applaud your efforts to experience all of Walt's original attractions during your visit - what a fun idea! That will be a great way to connect back to the original Disney magic that came with the park opening.
Attractions do go down at various times throughout the year for planned refurbishment, and the best way to get the official information on that is through the
Hours & Events Schedule on the Disneyland Resort website. You can filter for the dates of your trip and then there is an expandable section near the bottom of this page that lists attractions planned to be down for refurbishment.
However, this schedule is made available about six weeks out from the current date, so you'll still need to wait awhile for the dates of your trip to be made available. In the meantime though, as you continue to plan, make sure to check out the
Attractions and Rides page and filter it for 1955 Original Rides to get a comprehensive list of all the attractions that Walt had a hand in!
Similarly, you can keep an eye on the
Disney Parks Blog for more news about what's happening around the Happiest Place on Earth during your visit.
Thanks again for your question, Diego! I hope you have a wonderful time at the Disneyland Resort.
Have a Magical Day,
Greg