Vaccine rollout earmarks additional doses for hard-hit Mass. communities. But delivering on that could be a challenge By Deanna Pan Globe Staff,Updated December 22, 2020, 11:30 a.m. Email to a Friend A walk-in COVID-19 testing tent set up outside the Brockton Neighborhood Health Center in April.Barry Chin/Globe Staff When Governor Charlie Baker announced a sweeping plan to dispense millions of doses of COVID-19 vaccines to Massachusetts residents, he pledged a commitment to equitable distribution. That includes reserving 20 percent of the stateâs doses as bonus allocations for hard-hit communities in recognition of the disproportionate impact the virus has had on people of color.