One of the problems is there are no nights open for Thursday (Day 0) and Monday for those staying through the con for some of these hotels. So if you only book Friday arrival, checking out Monday, you can get something booked.
I hope there are plans to re-negotiate for the Thurs and Monday nights at the con-rate?
Last year I booked a room in 10 minutes, for Thurs through Monday.
This year it's taken me 50 minutes of frustration.
I have to come home from work to do this, because we can't use our computers at work for things like this, and now this isn't even a finished reservation. I have more work to do to contact people to get the other days added.