Free COVID-19 testing events being held in Grand Strand, Pee Dee on Saturday Administrators at Mount Vernon High School have been informed that a student has tested positive for COVID-19. (Source: WFIE) By WMBF News Staff | January 23, 2021 at 10:08 AM EST - Updated January 23 at 10:24 AM MYRTLE BEACH, S.C. (WMBF) - Some free COVID-19 testing events are currently happening in the Grand Strand and Pee Dee. DHEC’s testing schedule shows an event happening at Coastal Carolina University until 4 p.m. Saturday. This testing site is open every day from 9 a.m. until 4:30 p.m. at the KK parking lot.