Indeed, I wonder what is the reason. The only explanation I can think of would be that the event is already widely advertised by "authorized" partnering media - who thus have an interest in preserving the aura of the event - and scaring everyone unauthorized of trying to mention the event might be a disguised way to avoid critics. If you cannot name the super bowl, you cannot write an article about its ecological impact, the commercial revenues, the working conditions, etc.

But I have absolutely no knowledge about the event, so if anyone has a more informed opinion, I would be very interested.