It'll be July 17th at 7:00 PM at Microsoft in building 40/Steptoe. I'm told pizza will be provided.
Lloyd Moore, the organizer, wants a hint of how many will come, so +1 on this if you definitely plan to attend.
(Oh, and there's no charge.) Us D folks also often go out for beer afterwards. Watch http://nwcpp.org for more info later this week.