Week 17 of the Medford Farmers Market — the always popular annual Apple Fest edition — will feature live music by Kier Byrnes and Friends from 3 to 5 p.m. and Radam! from 5 to 7 p.m. Byrnes and Friends play a fusion of Celtic, Americana, Bluegrass, Polka and Country Rock. Radam! is the acoustic duo of Rish Green and Adam Ritchie; they cover British and American classics. Visit the Farmers Market website for the list of this week’s vendors, artisans, and other activities. The market takes place at the Condon Shell park from 3 to 7 p.m. every Thursday through October 12.