A circus, festivals and sporting events are among the "pop-up" vaccine clinics opening to encourage more people to get vaccinated against Covid-19.
NHS England said 31.5 million people were double-jabbed and it wanted "as many people vaccinated as possible".
Health Secretary Sajid Javid said it was "saving thousands of lives".
Spectators and passers-by at the Circus Extreme in Halifax were being offered a jab outside a tent of jugglers, acrobats and stunt performers.
John Haze, circus director, said: "It may not be the normal thing you expect to see when you enter the Circus Extreme Big Top,but we are really proud to be supporting the NHS Covid vaccination programme.