Pop-up sites and door-knocking are new tactics in the quest to reach the unvaccinated Stateâs vaccine strategy goes hyper-local in latest phase of rollout By Robert Weisman Globe Staff,Updated May 9, 2021, 4:58 p.m. Email to a Friend Now itâs all about the ground game. With more than 2.7 million Massachusetts residents fully vaccinated and the pace of COVID-19 shots slowing markedly, state officials are stepping up efforts to reach the holdouts. No longer is the stateâs campaign focused on moving thousands through mass vaccination sites such as Gillette Stadium, which is slated to close next month. Instead, the scene is shifting to smaller venues like American Veterans Hall in Haverhill, where at times last Thursday there were more vaccinators and support staff than people seeking shots. Kenyan-born Teresia Wanjihia was able to walk in, register, and get injected within minutes.