I generally feel that to call it history, you need some sort of perspective on what the changes resulting from the event were. In the Moon Landing's case you need to see it in the context of the Space race as part of the Cold War and the subtle shifts in balance achieved by America's getting there first, and also in the long term perpective of proving it could be done, but really not moving forward terribly from there.

In the cae of the Korean issue - If the shots fired are a border scuffle, it is of little historic interest - if it's the first shots fired in an international, potentially nuclear war, then obviously it has more importance.