http://seattlejugglingfestival.weebly.com/schedule.html (http://seattlejugglingfestival.weebly.com/schedule.html)
On http://www.jugglingdb.com/news/thread.php?group=1&offset=0&thread=171999&id=262519 (http://www.jugglingdb.com/news/thread.php?group=1&offset=0&thread=171999&id=262519) it says "Joe Showers will lead a workshop on Kendama ..... and lead a Kendama Battle". The workshop is scheduled for Friday at 2pm. Not sure when the battle will be.
Best of all... free entry. Anyone in the area should head along.