Things do turn up. I grabbed an 8 PM dinner a few days ago when it showed up out of the blue (3 weeks before trip). That's actually DD's bedtime, but I figured she could make it one night versus not going to CRT at all. Since then I have been checking vigilantly for an earlier seating. I have seen a couple of breakfasts pop up (that just weren't going to work for us) and a few dinner slots that were like 930 and 920. So if you REALLY want to go, I think you probably can if you are super flexible.
Good luck. I wish I had never mentioned to DD because really I would just as soon cancel at this point and save the $. She wouldn't even have known it existed, but now it's all she talks about!