Updated 5/28/2021 6:39 AM Several mass vaccination sites that opened this winter offering hope and drawing thousands of people amid a deadly surge in the COVID-19 pandemic are closing as demand for shots tapers down. On Thursday, Cook County Health officials retired vaccination locations in Tinley Park, South Holland and River Grove. Those sites will be consolidated with locations in Forest Park, Des Plaines and Matteson, which remain open. On June 14, the Lake County Health Department will shut down its largest site, at the fairgrounds in Grayslake. Nearly half of adults in Illinois are f...