As someone who works in content world, we do usually get everything ready beforehand if its not an unexpected thing. Some news are things that you can't know beforehand, like someone says something silly, or some president says something about it, those are all fresh news and not written before hand. However, I do believe that there are ups and downs all written beforehand, and we just change some stuff here and there. Doesn't mean that I do that, because usually my job is not that, but I do see others who does that all the time, if I worked in that department, like writing stuff in that topic, I assume I would have done it too.