Police are keen to hear from two men who may have been play fighting outside the fast food restaurant just before the incident
The argument occurred outside Bonito Grill, in Terminus Street at around 1.30am on Saturday 1, December.
It’s believed a man in his 60’s was knocked to the floor and banged his head.
Three men were arrested at the time and they have been released under investigation.
A further man has been voluntarily interviewed in connection with the incident.
Police are particularly keen to hear from two men who may have been play fighting outside the restaurant before the altercation and a woman who was pulled to the floor by one of the men.
Anyone with information is encouraged to call Harlow CID on 101 quoting crime reference 42/190082/19.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.