This isn't actually a drum circle for our group, but is an annual three day gathering in Seattle that comes highly recommended by Alan and Penny.
The website for the World Rhythm Festival is http://www.swps.org/. It has all the information that you will need. There is no admission fee for the event. You'll only have to pay for your lodging, meals, and transportation to get there. It starts on Friday but the events on that day are mostly for kids.
By indicating "yes" in your RSVP, we'll be able to see who is going to be there from our group. We can meet for meals, activities, or jamming.