Can some maverick go against the grain and explain what the hell a "CM" is and why other anons on this general are so secretive about it?

Based on what I've gathered from the obtuse babble in the past threads or so, it's some kind of upcoming event?

Why is it secret?
Wouldn't having more f2p nooby boobys like me understand and participate make it easier for le sekrit club of veterans to compete?

SPANK