Medford musicians Matt and Shannon Heaton, who host monthly online virtual Irish guided sessions, are presenting a complementary event on Facebook called “That Can Be Arranged.” As Matt and Shannon explain it: “Sessions can (should?) be loose affairs, with participants responding to one another/the moment. They are social events! They are casual! But performances, at least for the Heatons, are a different beast. When we put on a show, we like to arrange sets of tunes, and strike a neat balance of moods, grooves, textures, keys, meters. Wanna see how we arrange tunes? Join us on and be part of the arrangement!” Tune in on the Heatons’ Facebook event.