The Walnut Valley Festival 40 Years As Pickers Paradise 1972 - 2011 The Walnut Valley Association was formed in 1972, with... its sole purpose to produce the Walnut Valley National Guitar Flat-Picking Championships Festival, also known as the Flat-Picking Championships, currently known as the "Walnut Valley Festival" or simply "Winfield" to the long time attendees. Evolving from three days...