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A group of three assaulted a person on the 4th floor of Mooseheads Pub and Nightclub at about 1.50am.
Two of the three suspects were identified by police at the scene, however, one male left before police arrived.
Police have released CCTV footage of a man they believe can assist them with their enquiries. He is described as being Caucasian in appearance, with a medium build and short blond hair.
He was wearing a white patterned short-sleeved shirt and dark pants at the time.
Police are urging anyone who can identify the man or witnessed the incident to contact 1800333 000, or via their website.