I had difficulty making my reservation as they said that there was no IEEE block. The deadline is March 23 to insure getting the meeting rate or space in the hotel.
Full info is attached.
Attached is a registration form for hotel reservations. This special rate will apply from Friday, May 5 through Saturday, May 13 only. May is a very popular meeting month in Seattle, and the hotel will fill up quickly. If you want to be guaranteed a room, please make your reservation by the above date . The conference rate will still be honored after this date, but on a space availability basis only .