Michigan partygoers are being warned to watch for coronavirus symptoms after several who went to a Fourth of July event tested positive for the respiratory virus.In a photo shared by the Michigan State Police, hordes of people — not social distancing or wearing masks — can be seen gathered at Torch Lake over the festive weekend.“If you were at the Torch Lake Sandbar party over 4th of July weekend, you should monitor for signs and symptoms of COVID-19 and seek testing if symptoms should develop or if you were at high risk for exposure due to being in close proximity with others or not wearing a cloth facial covering,” the Health Department of Northwest Michigan said in a Friday statement.