COVID-19 vaccination event coming to Maryvale community this week Groups working together to offer a free, walk-in event for some of the lowest vaccinated zip codes. and last updated 2021-05-05 20:15:05-04 MARYVALE, AZ â Volunteers have spent the past two weekends going door to door in Maryvale to let people know that there will be a vaccine event in their community this Wednesday. Maricopa County Public Health, University of Arizona College of Public Health, Valley Interfaith Project, and St. Vincent De Paul Catholic School are working together to offer a free, walk-in event for some of the lowest vaccinated zip codes.