The Hyatt is showing it still has rooms available in our block (though we are down to 11% of the blocked rooms now). If the issue is with specific dates, we can probably get more rooms added for dates before or after the conference, but we've maxed out all the rooms the Hyatt will give us during the conference with the existing block. If you have issues booking with the online reservation system, I recommend calling the Hyatt: 425-462-1234.
We've got an overflow block at the Westin Bellevue, which is attached to the Hyatt via sky bridge, and so is very convenient. When we got the reservation code up last night, it wasn't allowing rooms booked before Wednesday June 20 and presumably after Saturday the 24th. We've asked them to add "shoulder dates" at the group rate so those coming in early or leaving later can get rooms at the group rate.
We'll be adding additional overflow rooms at nearby hotels as needed.
The hotel and registration is filling up a bit faster than we anticipated.