Sign-ups end on October 14, however, you might have some time into October 15, depending on when I get organized that day. Don't count on it, though. ~_^ I'll add a closing reply on both communities when sign-ups are over.
Also, there's about three times as many sign-ups this year, compared to the past few years, so I'm going to give myself an extra day to do the matching. You'll receive your assignment on Friday, October 16.
Finally, several of you asked to join the community. The first exchange was self-posting, which is why there are some community members that have had their memberships grandfathered into the current exchange format. I can't recall there ever being a locked post on the communities, so please don't worry that your membership requests have been turned down. Watching the community will work just as well.
If you have any questions or issues, you can reply here. Thanks, everyone! It's exciting to see so many people this year!