NO rooms at CSR end of summer?

[jlk806]

We are DVC and have enough points for 7 nts at BCV. We typically stay 7 nts DVC and 3 nights either before or after at either value/mod (last year had to try out AoA). Really wanted to try CSR this year but there are NO rooms available on any nights during the 2 week period we could be there (our exact dates are flexible over a 2 week period, we want 10 nights total, 7 DVC 3 CSR). Do they hold rooms in case a convention books and then release them to the public? According to the 2013 convention schedule nothing is scheduled over the dates we are trying to book (mid-end Aug). I find it odd that without any special offers out (free dining, etc) the resort is COMPLETELY sold out, all nights, all room types this far in advance.