Table 4. Adaptations to the “Motivate, Vaccinate and Activate” strategy components during the implementation period from February 1 through May 19, 2021.

Strategy component	Original design / aim	Description of adaptation(s) made	Was adaptation planned or unplanned?	When was adaptation made?	Why was adaptation made?
Motivate (Community mobilization and demand generation activities)	Multi-method outreach approach to mobilize community members and generate demand for COVID-19 vaccination.	We initially focused on direct recruitment from CBO networks, those eligible on our testing lists, and in-person registration at the site (capitalizing on it being located at a busy transport hub). As eligibility expanded, we began undertaking direct sign ups at other sites (i.e., food hubs, grocery stores). We also began providing flyers/cards with QR codes to sign-up for vaccination at key locations (i.e., food hubs, school drop off/pick up) Later, we began promoting a direct sign-up link (e.g., via community signage, websites) for anyone to register.	Planned	Throughout the implementation period	To address changing vaccine eligibility. To maintain demand for vaccination.
Vaccinate (Community-based, low-barrier, client-centered, vaccination site)	Provide vaccinations 4 days a week without any unplanned closures in order to avoid the inconvenience of rescheduling among socioeconomically vulnerable individuals.	Infrequently needed to close the site on a planned operating day	Unplanned	Throughout the implementation period	To be responsive to events affecting local community (i.e., George Floyd verdict) No closures due to vaccine stock-out.
	We aimed to provide evening hours to facilitate improved access to those who work.	Unable to provide evening hours (site open 9am-4pm)	Unplanned	Early	Given outdoor, community location, evening hours were not felt to be safe.
	In-person scheduling co-located at the UeS neighborhood vaccination site in order to improve convenience.	In-person scheduling moved to UeS neighborhood testing site.	Unplanned	Early	To reduce congestion. To improve efficiency (many direct referrals from testing site).
	Provide timely vaccination to all eligible community members who desired to be vaccinated at neighborhood site.	Provided vaccination referrals to local safety net hospital. We worked closely with local hospital staff to utilize open same- and next-day appointments. Referred clients provided transport if needed Referred clients either escorted by or met at hospital by UeS site to provide support.	Unplanned	Early-middle	At times demand outpaced timely appointments available. To get motivated community members vaccinated as soon as possible.
	Only on-site, in-person registration offered in order to prioritize access for those without computer access/skills.	On-line registration offered	Unplanned	Late	To address changing vaccine eligibility. To maintain demand for vaccination.