Wellesley officials are hosting a walk-in flu vaccination clinic on Thursday for Wellesley residents age 18 or older. The clinic will be held from 9 a.m. to 3 p.m. at the Wellesley Hills Congregational Church at 207 Washington St. Medicare and certain insurance plans will be accepted. Donations are also welcome, organizers said. Caregivers of homebound residents should contact the Wellesley Health Department at 781-235-0135 to schedule an appointment. For more information, visit wellesleyma.gov/health.