According to this article, in 2021 'We saw television crews in Epcot and Magic Kingdom a couple of times. To our knowledge, filming was done November 10-14 and again around November 30 and December 1. This isn’t meant to be an exhaustive list; it’s entirely possible that recording occurred other days or in other parks and we just missed it.'
In recent years the majority/all parade taping was done in DL, CA. Other special performances were filmed at WDW in FL.
Dates have not officially been announced for 2022.
I always wonder if resort rates tell you something is going on, even if we don't know something is going on! Those nights were higher than others on our per night breakdown! LOL