Sara Grant, The Denver PostBlake Shelton performs a free concert at Grizzly Rose in Denver July 28, 2016. Sara Grant, The Denver PostBlake Shelton performs a free concert at Grizzly Rose in Denver July 28, 2016. Sara Grant, The Denver PostFans cheer for Blake Shelton at a free concert at Grizzly Rose in Denver July 28, 2016.Sara Grant, The Denver PostBlake Shelton performs a free concert at Grizzly Rose in Denver July 28, 2016.