Stork,
I had received an email on April 25th from my TA that has always taken care of our Fort reservations confirming that we wanted Halloween for 2021. We sent her the dates that we wanted and she said that she would book as soon as the days became available. I assumed that the dates would be booked as soon as the 499 day window opened. I was unaware that the 499 day rule was not being used at this time.
Steve