Credit Pure Michigan Grand Traverse County has the second-highest COVID-19 vaccination rate in Michigan, but in a few weeks, it’s hosting a festival that could bring in more visitors than the county has residents — with no way to know how many of the tourists are vaccinated. That raises some thorny questions for health officials and event organizers in Grand Traverse and other tourist-heavy counties in Northern Michigan and the Upper Peninsula: How can they prevent festivals from becoming super-spreader events? How can they make sure their tourism industry doesn’t inadvertently infect their local population, while visitors who seed outbreaks get to go home without facing any consequences?