It occurred between 4.30pm and 5pm on Friday 6 July 2012, when a 23-year-old local man was walking along Westgate towards Thirsk.
As he approached the junction of Westgate and Sowerby Road one of a group of men shouted racist abuse and someone threw a can of lager at him. When the victim turned to walk away from the group, one of the men then assaulted him.
As a result of the assault the man suffered a cut above his right eye and bruising around the eye and cheekbone.
A 19-year-old man and a boy aged 16 who were arrested in connection with the assault have been released on bail to allow for further police enquiries.
PC Julie Kessell, of Thirsk Safer Neighbourhood Team, said:
I ask anyone who witnessed this incident to contact the police or Crimestoppers straight away.
I am particularly keen to speak to anyone else who was in the group of men, so that I can get a clearer picture of the circumstances around the incident.
Anyone who can assist with this enquiry is asked to contact Thirsk police on 101, select option 2 and ask for Julie Kessell.
Or call Crimestoppers anonymously on 0800 555 111 quoting reference number 12120109313.