Week 17 of the Medford Farmers Market — the 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, which include apple-themed coloring and also face painting. After today there are two more markets this season, on Thursday, October 5, and Thursday, October 12.