The CRT will be the problem. Call Dining NOW and see if there is anything open. Call everyday until your trip if you have to.
Other spots you can try to change but if I were you, if you aren't able to rebook I would just show up. Since you're likely already at a 6 topper, the hostess is usually able to easily accomodate an extra. But at CRT, there is a deposit and odd shaped tables to work around.