We were there in 2018 for the parade filming and saw Gwen Stefani perform. It did not make a difference in crowds throughout the park, and Main Street was no more packed than it usually is during the holiday season. We were there for 10 days that year and the crowds were similar on non-filming days. It was actually really neat to see the production in action! We will also be there this year Nov 11- 20th and not really concerned which day filming will take place. If it is happening on one of our days, it will be a pleasant surprise.