Sierra Hull - photo by Louise Geri The audience at Sierra Hull’s performance at Northwest Tune-Up Bike and Music Festival was a far step from what I’m used to in the bluegrass scene, as someone who didn’t listen to much bluegrass before moving to Nashville. The Puget Sound was the backdrop to a massive Bellingham festival fairground filled with girls in jorts, kids running around with bubble wands, food trucks lining the lot, and perhaps strangest of all, massive man-made dus