Dr Helen Wall, who is leading the vaccination effort in Bolton, said the target for Saturday was to distribute 4,000 jabs.
She said 10,000 people eligible for jabs had yet to be vaccinated in the BL4 and BL5 postcode areas, with issues like not having phone credit to make a booking often cited as a reason for putting off taking the vaccine.
Asked what would happen if a younger person turned up for a jab, Dr Wall said vaccinators were following the guidance but would "look for reasons to vaccinate people, not reasons not to within those criteria of eligibility".