A man suffered "significant injuries to his face" in what police believe was an unprovoked attack.
The 31-year-old man from Burnley was attending the Neighbourhood Weekender festival in Victoria Park, Warrington with his girlfriend.
Detectives said the man was punched in the face at around 7.15pm on Sunday, September 5, in a suspected unprovoked assault.
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The attack is said to have took place 150 metres from the back of the main stage near to the bar on the left hand side.
The victim was taken to Warrington Hospital by paramedics and still requires ongoing treatment, police said.
The man's attacker is described as white, around 5’10” tall, of an average to slim build with a number of individual tattoos on at least one on his legs.
He is believed to have been wearing a khaki green bucket hat, short sleeved dark green t-shirt and shorts.
Enquiries have been ongoing and police are encouraging anyone with information to get in touch.
Detective Constable Laura Gilbert, from Warrington’s Local Policing Unit, said: “This was a serious and what we believe to be an unprovoked assault while the victim was with his girlfriend.
"He sustained some significant injuries to his face which will require ongoing hospital treatment.
“Since the assault was reported to police we have been conducting numerous enquiries including viewing CCTV footage and are keen to hear from anyone who may have information.
“The area was busy at the time the assault occurred with revellers enjoying the music and therefore someone may have seen the assault take place and I would ask you to come forward.
“I also want to appeal to anyone who may recognise the man described as being the alleged offender or perhaps you have photos or videos that identify him or show the assault taking place, if so please do get in touch.”
If you can assist detectives with their investigation please contact Cheshire Constabulary via 101 or by visiting the force’s website and quote IML 1079201.
Information can also be provided anonymously by calling Crimestoppers on 0800 555 111.
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