Booked Louvre tickets for THINGS exhibition Dec 24th earlier than I could for Permanent Collection

I wanted tickets for the Louvre's Permanent Collection on December 24th but could not buy them this far out. I went to their Things Exhibition which also includes the Permanent Collection for the same price and was able to buy tickets on December 24th at 10 a.m. So, unless I did something wrong, and you want to secure tickets for December, you might try the same route that I did.