People will be able to sign up until Tomorrow night which is the 4th of Aug, after that you will be requested to wait until the next round is up, of course it depends on how long this one lasts to when the next one will start.
The more the merrier!
So tomorrow I am hoping to get the sign big enough to read from my avatar. So it will be easy to find. Just find a post that I have made or drop by my PDA.