Big E vaccination site now taking walk-ins Updated May 10, 2021; WEST SPRINGFIELD — The West of the River Collaborative COVID Vaccination site at The Big E is now open for walk-in recipients with no appointment necessary. The West Springfield Board of Health made the announcement Monday and it was effective Monday as well. Hours are 10 a.m. to 2 p.m. People are asked to bring their insurance card and are told that they will be registered on site. The Big E site is offering the Moderna vaccine available to those ages 18 and up. At the last count, the Big E site has administered 3,496 vaccines since opening April 20, said Jeanne Galloway, West Springfield director of Public Health.