DETROIT Michigans biggest political event of the year, the Mackinac Policy Conference, is officially cancelled due to the ongoing pandemic. The Detroit Regional Chamber announced Tuesday it will not convene groups of 50 or more people for the rest of 2020. Earlier this year, the Chamber rescheduled to annual conference for August, but it has not been fully cancelled. It draws the biggest political and business leaders in the state. Just like everybody else, we will find new ways to execute our traditional role, the Chamber said in an email.