Heather Cherone | May 28, 2021 4:42 pm (WTTW News) After two months and 42,000 jabs, the city-run mass vaccination site near Wrigley Field will close Saturday, as efforts to bring a COVID-19 vaccine directly to residents ramp up, officials said. Thanks to our sponsors: The mass vaccination site at the American Airlines Conference Center at Gallagher Way, administered by Advocate Aurora Health and the Chicago Cubs, opened April 5, along with a mass vaccination site at Chicago State University in Roseland on the South Side. When the site near Wrigley Field opened, officials said it had the capacity to administer approximately 2,000 doses of the COVID-19 vaccine daily.