A walk-in clinic for the Pfizer COVID-19 vaccine will be held Tuesday, July 27, from 4 to 6 p.m. at the City Hall Annex at 50 Evergreen Ave. No registration is necessary, but if you prefer, you can pre-register at somervillema.gov/vaccine. The clinic is free, and open to all people 12 years or older, regardless of immigration status or health insurance. Identification is not required. All minors must have parent or guardian permission. Anyone 12-15 years old must be accompanied by a parent or guardian. Permission forms will be available onsite, or you can download one here. If you need assistance, please call 311 (617-666-3311).