We are also planning on going August 2021. With all the uncertainty going on the safest bet imho is to book a package with hotel/tickets and reserve the parks. It is only a $200 deposit fully refundable if you cancel up to 30 days before check-in and full amount needs to be paid also at the latest 30 days out. Even, worse case scenario you need to cancel less than 30 days and up to 24 hours before check in you are only out the $200. For us even that is better than being stuck with non-refundable tickets we may or may not use in the future. Good luck.