The incident took place in the early hours of Sunday 19th September at Cirque Manchester, Queen Street.
One man was treated in hospital for a head injury.
PC Christine McIntosh, of GMP’s City of Manchester district, said: “Fighting occurred inside the premises and continued onto the street where barrier poles were used as weapons.
“We have identified a number of men would like to speak to in connection with the incident.
“We are keen to speak to anyone who may know these men or were in the area at the time.”
Anyone with information should call police on 0161 856 3221 quoting incident 601-190921.