I had plans in place with another person to come with me plus there are lots of other things I have to consider, not the least of which is the driving time. When it is pretty evident that the race isn’t going to happen, I think it is appropriate to make the call as early as possible.
When I have plans to attend a race that is the dominant part of my day and I can’t wait until the middle of the day to know what I am doing. I am sure there are other fans that also have a considerable drive too. It is not unreasonable to expect an early notification.