Hey there Josh,
Welcome to planDisney and thanks for your question - good eye in catching this! I so wish I had some secret insider knowledge here, but unfortunately, I do not (we're Guests just like you here at planDisney).
I also am seeing on the
Events Calendar that Disney California Adventure Park will close at 5:00 PM on November 13, but I don't see any details on the Disneyland Resort website or the
Disney Parks Blog.
This could be any number of things including a private event, filming for an upcoming holiday parade special, or some other special event. I always recommend keeping an eye on the Disney Parks Blog and if it is something that is open to the public then you should see it there.
However, it does look like Disneyland Park is open until 12:00 AM that day, so if you have the
Park Hopper option then I would recommend starting your day in Disney California Adventure Park (we love grabbing breakfast at
Pym Test Kitchen!) then you can hop over to finish your day at Disneyland Park if you're planning on visiting for the full day.
Thanks again for your question, Josh! I hope you have a fantastic trip to the Happiest Place on Earth.
Have a Magical Day,
Greg