I'm Sacramento FreeQ,but right at the moment I'm in Yosemite National Park,so I can't say about current traffic. It's not closed, and neither is Mather. They are commercial airfield's now.
David will no longer go to such locations without a satellite beacon device and a loaded firearm. If you have children with you--DO NOT let them out of your sight.
And even at that--there have been convincing, multi person seen instances of a toddler about 5-8 or so feet ahead of the parents on a trail in broad daylight--and one second the toddler is there on the trail in full view and the next second, the toddler has blinked out--totally disappeared. NOT off the side of the trail; NOT fell in a hole; NOT StarTrek faded out--just instantly disappeared--and no sign can be found for an extended distance from that spot.
Yosemite is one of the National Parks with one of the largest numbers of such disappearances in the world.