The first assault took place at approximately midnight on Thursday 14 March in the toilets of licensed premises.
The male was struck to the back of his head. Another male went outside the premises to phone for an ambulance and as he was about to use his phone he received a blow to his nose.
He was then struck several times to the left side of his head and ear. This second assault occurred at approximately 12.15am on Friday, 15 March.
Police would ask anyone who may have witnessed these assaults or who has any information to contact them at Woodbourne on 0845 600 8000.
Or, if someone would prefer to provide information without giving their details, they can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111.