Time, Place, and Partnerships: Event Characteristics and COVID-19 Vaccine Uptake in Community Vaccination Efforts.

Understanding how vaccination-event characteristics relate to doses administered can inform public health delivery strategies. This study examined associations between modifiable characteristics of community-based COVID-19 vaccination events and doses administered per event. We conducted a retrospective analysis of 631 vaccination events coordinated by the Louisville Metro Department of Public Health and Wellness (LMPHW) in Jefferson County, Kentucky, between March 2021 and May 2022. The outcome was the number of COVID-19 vaccine doses administered per event. Multivariable regression models assessed associations between event characteristics and doses administered per event. Across all events, 27,767 COVID-19 vaccine doses were administered. Each additional hour of event duration was associated with 21.6% more doses administered per event (95% CI: 14.0-29.8%). Weekend events were associated with 87.8% more doses administered per event than weekday events (95% CI: 45.7-142.0%). Compared with government-hosted events, 44.7% more doses were administered at non-profit organizations, 110.0% more at business organizations, and 57.8% more at medical service providers. LMPHW-only events were associated with 198.4% more doses administered per event than partnered events (95% CI: 120.1-304.6%). Principal findings were generally consistent across sensitivity analyses. These findings may help inform planning of future community vaccination and other immunization initiatives.