I hope that anyone who is at all unsure about how to act at any event in the US (or anywhere) has read this thread and the Fair Hill thread, and that you “get” the takeaway: please put your horse’s welfare, well-being, and treatment FIRST.
That is all you need to remember. If you do that you will not have 68 pages of comments written about you. And gee whiz you might learn how to be a passable horseman in the process.