I usually go at slow times. The last time was the last week of Jan/first week Feb this year. I couldn't get a FP+ after many, many tries, but we just walked in one day during the week. At the time, they were accepting FP+ for lunch only; no breakfast served either. Now, they have breakfast there and you can reserve lunch. You can keep trying to see if there are cancellations. Looks like you are going Thanksgiving week--one of the busiest of the year, so maybe if you are there the entire week, try either Mon, Tues, or Wed before TDay to walk in--I've never been that week because I hear it is absolute craziness, especially on TDay and Black Friday. Good luck and I'm sure you'll have a great time no matter what.