COVID-19 vaccine: Lake County Fairgrounds converted to drive-in vaccination site WLS Share: GRAYSLAKE, Ill. (WLS) -- The line seems long, but Lake County officials say it's organized so no one has to wait very long before getting inside the event center at the Lake County Fairgrounds. The county's first mass vaccination site is now waiting on the vaccine. They have set up in the 65,000-square-foot site because it allows them to vaccinate as many people as quickly and efficiently as possible. "If we can keep people in their cars, drive in, drive out. Keep our vaccinators safe and warm, that's really our intent," said Mark Pfister, Executive Director of the Lake County Health Department.