This segment is a great look at the Farmers Market on Mercer Island starting this Sunday and going through October 11am-3pm.
There are lots of Farmers Markets in the area. The paper posted times and dates for various markets last year which I assume are the same for this year: The Crossroads Market Tuesdays noon -5; the Bellevue Market Thursdays 3-7, the Issaquah Market Saturdays 9-2, the Juanita Market Fridays 3-7, the Kirkland Market Wednesdays 2-7 and the Redmond market Saturdays 9-3. It seems like you can find a market just about every day of the week in the local area.