I just assigned the dates of September 30-October 4, 2013, yes, 2013, to a guest host.
The guest host sign-up entry will be temporarily closed until around June, 2013. At that point, the entry will re-open and everyone is more than welcome to sign up again.
So if you'd like to sign up in one of the remaining 8 spots, please do so now. synnerxx will more than likely disable comments to the guest host sign up entry sometime this weekend.
eta: As of November 27, 2012 the guest host signup are closed until June 2013. However, if pinch-hitters are needed, we will turn to those who have already signed up and asked if they would like to help. If that happens, they will not lose the spot they are currently signed up for.