Hi Jose! Thanks for dropping by planDisney.
If you're curious about Attraction refurbishment plans ahead of your visit, there's a handy
Daily Events Schedule you can check for the days of your trip. You can also check each Attraction's page and adjust the date to see what the hours of operation should be. I took a look for you, and
Space Mountain in Tomorrowland in Disneyland Park is not planned for closure on your preferred day. If you're staying at one of the
Disneyland Resort Hotels, it should also be open during
Early Entry. However, that is subject to change, and sometimes Attractions need to close temporarily. You can always check back if that happens, as sometimes they reopen later on in the day after a brief closure. I hope you get a chance to experience this iconic race through the cosmos. It's one of my favorites and always on my must-do list.
There are so many exciting
thrill rides to experience, including elsewhere in Disneyland Park.
Big Thunder Mountain Railroad in Frontierland and
Star Wars: Rise of the Resistance in Star Wars: Galaxy's Edge are another two of my favorites. They both should be open while you're visiting as well, so get ready to have a blast!
Have a magical day.
Elizabeth