The Honor Flights were allowed - BUT, the general public was barred since the Obama Admin. reasoned that they didn’t have any 1st Amendment assembly rights ...
Arrest me and cite the portion of federal law that gives you the slightest authority to close a national park ‘because you said so.’ You can’t apply trespassing without having the actual authority to bar someone entry. NPS might even try to wiggle through loopholes by stating that they’ve simply changed the hours of operation to none; but federal law REQUIRES national parks to be open absent actual emergencies or dangers to the public, and an overflowing trash can, much to the dismay of the NIH, isn’t a public health hazard of significant level.