The Celtic Junction Arts Center present Medford's Matt and Shannon Heaton in a Valentine's Day concert playing updated and traditional Irish music on flute, accordion, guitar, bouzouki, and voices. With engaging stage presence and masterfully crafted music, the Heatons offer well-traveled Irish music from the heart. Steeped in sessions in County Clare and brewed in the acoustic music scenes of Chicago and Boston, their flute/guitar/bouzouki instrumentals and sweet husband-and-wife harmony singing draw deeply from the Irish tradition. The Heatons also gently incorporate…