An Accrington man was headbutted in an ‘unprovoked attack’ at a funk and soul night.
The 53-year-old was followed into the men’s toilets at King George’s Hall in Blackburn and as he turned to walk out was headbutted, causing him to fall to the floor.
Police officers are appealing for witnesses and said a man they want to trace is white, 5ft 7ins, between 45 to 55 years old and bald.
PC Neil Ogden, from Blackburn Police, said: “We are determined to find who was responsible for this unprovoked attack.
“This man may be a potential witness to the assault and so we are asking him to come forward and speak to us.
“If this is you or you recognise this man, please get in contact.”
The incident happened at around 1.25am on Saturday, April 25.
Anyone with information can call PC 4456 Neil Ogden or PC 3853 Karen Wallace from Blackburn Police on 01254 353970.