Please cancel that ADR. This one is not going to work with the little ones, and will not get you get one that will be a better time frame. Akershus has the Princesses, and is wonderful. Frankly, if you could try for 1900 Park Fare dinner at the Grand Floridian, you might be much happier. Cindy and Charming do appear there, and they are joined by Lady Tremaine and the Stepsisters. The meal is a buffet, and is pretty good, but much less money than CRT> and the kids can dance in the Grand Ballroom if you are there when the Grand Orchestra is entertaining.
Even if you cannot get a better time for CRT, you may find that booking a different restaurant, or just stopping for a Counter Service meal can be as satisfying. It is impossible to get it all done, and Disney is not going anywhere, so CRT will be there next trip, as will so many more dining "Hot Spots."
You did not ask, but the advice I give "newbies" is that there is no way to get it all in, and there is nothing that is so "must do" that you wear yourselves out trying to fit it in. Your trip needs to be "workable: in that your meals are convenient, your FP are made in a way that does not have you racing from one end of a park to the other, and your plans are not so tight that you are barely into one attraction or meal before you are trying to get out to get to the next. Enjoy your moments.