Yes, I apologize, it's badly worded. The deadline is for regular assignments for the main Remix challenge. Authors aren't revealed until 2 weeks later, because we'll need time for post-deadline pinch hits. Neither collection will be revealed until Oct 14 at the earliest.

So there's no deadline for Madness, exactly. It's sort of a free for all version of the regular challenge. You can keep posting prompts and/or fills up until authors are revealed and the challenges end, on Oct 21 at the earliest (dates subject to change, if pinch hitters for the main challenge require more time).