Two men have been arrested following a fight at Folk on the Green in Stony Stratford on Sunday.
Officers from Thames Valley Police were called to the event which was held at Horsefair Green, at around 5.30pm.
When they arrived they found a fight taking place involving several people.
A 25-year-old man from Stony Stratford and 17-year-old boy from Lewes, in East Sussex, were arrested.
They were both arrested under Section 4 of the public order act (causing fear or provocation of violence). The man was also arrested on suspicion of assaulting a police officer.
They have both been bailed, the 17-year-old until August 2 and the man until August 3.
Bob Adams, chairman of Folk on the Green said incidents like this were rare.
He said: “We’ve a proud track record as a popular family-friendly local event.
“This year was our 42nd year. We’ve always worked hard to create a pleasant environment where everyone can relax and enjoy some good music.
“Our open access policy is an important part of making our event available for the whole community to enjoy.
“Fortunately significant incidents requiring police intervention are extremely rare, but now and again a few individuals manage to spoil it for everyone else.
“However, in spite of what happened, the vast majority of our audience said that this year’s Folk on the Green was one of the best ever.”
A Thames Valley Police spokesman said they wanted to reassure people and anyone who had any information should call them on 101 or Crimestoppers anonymously on 0800 555111.