Week 17 of the Medford Farmers Market — the annual Apple Fest — will feature live music by Kier Byrnes and the Incredible Jason (aka Jason McGorty) from 3 to 5 p.m. and Radam! from 5 to 7 p.m. Byrnes is a founding member of Three Day Threshold, which plays an eclectic combination of gypsy, Americana, Celtic and country rock. Radam! is the acoustic guitar duo of Rishava Green and Adam Ritchie. Visit the market’s website for the list of this week’s vendors and other activities. After today, there are two more sessions of the Medford Farmers Market, on October 6 and 13, from 3 to 7 p.m.