More COVID-19 vaccination sites set to open in Williamson County By Cory Dinkel WILLIAMSON COUNTY, Texas - Williamson County says its volunteer-run Vaccine Registration Technical Assistance (VRTA) centers have proven to be a positive tool to assist residents with the registration process for the COVID-19 vaccine. During the week of March 1, the county says more than 300 people received support at a VRTA center. Family Hospital System hosts 24-hour ‘Vax-A-Thon’ in Williamson County The event is taking place at the Kelly Reeves Athletic Complex and is by appointment only. Those who are eligible have already been sent out an invite.