First Look at Work Underway at United Center as Crews Transform it Into Vaccination Site Already, crews were seen setting up in the parking lot of the arena Friday morning, just before the White House announcement Published February 26, 2021 • Updated on February 26, 2021 at 12:53 pm NBCUniversal Media, LLC Work is already underway to transform the United Center into a mass vaccination site. The White House announced Friday that Chicago sports venue would open as a pilot Community Vaccination Center on March 10. It is expected to vaccinate 6,000 individuals a day. Download our mobile app for iOS or Android to get alerts for local breaking news and weather.