The Brief A 37-year-old Auburn Hills man remains hospitalized after he was brutally assaulted at a music festival in Northern Michigan. Lonn Hartman was found with lacerations around his neck on Sunday morning. More than a week later, following Hartman's assault at a Northern Michigan music festival, he remains in the intensive care unit at a hospital. The assault has left the community shaken and Hartman's friends at a loss for words. Dig deeper:Blissfest is an annual music festival that takes place in Harbor Springs in mid-July.