As people begin filtering into IMMA for the final time of the June bank holiday weekend, there is an easiness in the air. The audience is noticeably more mature than those of days gone by and most certainly of a more relaxed disposition. There’s not so much a hum of excitement, but rather a coolness- a feeling that says, “take it easy folks, have a nice one”. Easing the crowd into the day on the mainstage is Glasshouse, a chamber ensemble performing the music of Bon Iver, for a moderately sized crowd. Their interpretations of Justin Vernon’s work is a…