The original incident was 2014, and I'm pretty sure it was posted on the forum.
This is a good update, because it turns out the CHiP had done the same thing at least once before, and at least twice since.
States vary, but that's the general protocol.
His Patreons (or other subscribers) of a certain level got a heads-up. He hadn't planned to do a public appearance, but gave into demand and did a limited meet-and-great that wasn't open to the general public. Mostly because of time constraints, he said.