Two pop-up vaccine clinics open in Jacksonville today Vaccines available on first-come, first-served basis from 10 a.m. to 7 p.m. Staff, News4Jax Updated: Tags: (AP Photo/Mary Altaffer) (Copyright 2021 The Associated Press. All rights reserved.) JACKSONVILLE, Fla. – On Friday, there will be two pop-up clinics in Duval County where residents can get the COVID-19 vaccine without an appointment. The sites, both of which are supported by the Gateway Mall Community Vaccination Center, will offer the Johnson & Johnson vaccine to adults on a first-come, first-served basis. Both pop-up clinics will be open from 10 a.m. to 7 p.m. on Friday. Below are details on their locations: