You know all those reservations that were cancelled because of the shutdown? Mine included for last week? Well, Yosemite is notoriously difficult to get into. Normally you need reservations months in advance and they fill up on the opening day.
So I checked today and found out they have sites available in the popular campgrounds!! I made a reservation for four days starting 9 days from now.
So if there is some place you could never get into, you might want to check Recreation.gov because they have spaces available.