Reply As of Thursday afternoon, 51,900 people have been vaccinated in Solano County and 20,500 have received the second dose. (Shutterstock / Kunal Mahto) SOLANO COUNTY, CA — A large-scale coronavirus vaccination event is scheduled for Saturday at the Solano County Fairgrounds for residents within the eligible tiers, which in Solano County now includes those 65 and older who have a preexisting health condition. The event is called the Solano County COVID-19 Vaccination Hub and takes place in the Expo Hall at the Solano County Fairgrounds, 900 Fairgrounds Dr. in Vallejo. To be included in the vaccination event Saturday, eligible residents need to book an appointment online or call 707-784-8655.