They do? I know active has it, but I'm not sure that's been allowed/offered for Disney races. Interesting.
From what I've read on the various FB groups, they have been doing case by case partial refunds (in the form of disney giftcards) for reasons they, at that time on that day, deem worthy.
OP, decide if you want the trip to be a race weekend. If you do, sign up for it and make it happen. If you don't, don't sign up for it. Even though they have been looking and refunds case by case, they probably won't do that for forever, and it's really best to just make it happen if doing the race is what you want to do.