Pictured is Memorial Hermann Sugar Land Hospital. (Photo courtesy of Memorial Hermann) James LaCombe The Memorial Hermann Medical Group (MHMG) is now offering free walk-in COVID-19 vaccinations to community members across Greater Houston, according to a May 3 news release from the hospital system. First- and second-dose walk-ins are now being accepted at select Memorial Hermann hospitals and clinics for individuals 16 years of age and older across the region, including the MHMG Physicians at Sugar Creek clinic at 14023 Southwest Fwy. in Sugar Land. Eligible community members can come in during the clinicâs operating hours from 8 a.m â 5 p.m. Monday through Friday and 8 a.m. â noon on Saturdays to receive the vaccine.