The 1st & 3rd Saturday of the month you'll find a session hosted by Ming at the Couth Buzzard's used bookstore / Espresso Bruno's at 8310 Greenwood Avenue North, in the heart of Seattle's Greenwood neighborhood, 2 doors down from the Post Office.  It's right on the the Metro 5 route, so easy to get to (get off at N 85th or N 80th St).  The Couth Buzzard is Greenwood's favorite used bookstore, and Espresso Buono serves great panini sandwiches, so this is a nice destination even if one is not planning to play music.  Their website is  www.buonobuzzard.com