The Medford Farmers Market opens its 18th season and its ninth year at the Condon Band Shell Park on Mystic Valley Parkway. The Opening Day live music performers, artisans, and other vendors will be announced. If you are interested in performing at the market, please submit your information through the Market web page. The market will take place every Thursday from 3 to 7 p.m. through October 16. For more information or to receive weekly updates via email, please visit…