As well as the first aiders, St John Ambulance also has volunteer doctors at the fair.
Bowes said: “We can pretty much do anything that they can do at Hull Royal other than giving blood transfusions or X-rays.
“Our doctors can do any stitching, suturing here.”
As well as providing assistance at the fair itself, the volunteers also serve residents who live in the vicinity of the event.
“If someone’s unwell in this area, because it’s actually quite difficult to get emergency services to them, they call us out to help,” Bowes said.
The annual event, one of the largest travelling fairs in Europe, runs until 23:00 BST on Saturday 17 October.
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