 The really big event he's talking about is the Fed's public statement that's released at the end of each FOMC meeting. It includes whether or not the Fed's changing the federal funds rate and why. Those statements are pretty clear. And Conte Brown says any public comments from Fed folks in the days immediately beforehand could muddy that message. So when the Fed speaks with a mumble and speaks vaguely, then its ability to accomplish its goals is undermined.