Washington DC Capital Holiday Parade Canceled?

On November 21st just three days before the November 24th Washington DC Capital Holiday Parade was supposed to take place a group of participants were notified (early in the day) that the parade was canceled. Twelve hours later and there is no word of it in the news. The parade's website is still showing the parade is on as scheduled. Why would they not notifiy the public? If there is a reason to cancel a parade why not warn all those people planning to go to the event? How many are already on their way? Interesting.