I just booked 9/19-21 at 4Pts Central (the "official" hotel for this 'Do!), for Cash and Points ($45 plus 2800 pts/night).
For 9/18-21 (3 nts), Central didn't come up, but Saturday to Monday did work. For Friday to Monday, the Olympiapark is offering C&P too.
This seems like a great deal--especially for those of you who were forced to book the Central for the inflated rate (8K+?) and don't want to use all your points.....
I now have an extra room at the Renaissance for the same nights, but I think I will be able to get friends to join me.