So apparently, Mars is to be as big as the moon right around September 4th, an event that only occurs once every few hundred years. And, of course, because it happens so rarely, it's very important and must be seen. People with rooftops have been planning Mars-sighting parties; brides and grooms are incorporating Mars into their toasts, and wild animals are planning an invasion. (Question: are all rare things in fact important and marvelous?)
As it turns out, it's a big rumor. Mars will be bright and shiny, but big as the moon? Nope. Oh well.