Football grounds are among hundreds of venues offering adults the chance to "grab a jab" this weekend without an appointment.
Newly-promoted sides Watford and Peterborough United opened their stadiums for walk-in inoculations.
The Pfizer vaccine is being offered to over-18s yet to receive their first jab and other age groups who can show they are awaiting their second.
Watford's mayor, Peter Taylor, described it as a "tremendous effort".
Officials at Peterborough United's Weston Homes Stadium reported a "steady flow" of people keen to access the mass vaccination offer.
According to NHS England data released on Saturday, a total of 64,089,251 vaccinations took place in England between 8 December and 25 June - including first and second doses.