Durham Regional Police say they were called to the bathroom of The Hub at 2 a.m. on Saturday.
They found a 26-year-old man on the bathroom floor. Police say he had been beaten with a beer bottle.
Police say two suspects were involved, whom investigators are trying to identify.
Both suspects are described as black males in their mid-20s, both about six feet tall and both with a medium build and short black hair. One wore a red hooded sweatshirt and had some stubble on his face. The other had camouflage-style pants on.
Anyone with information is asked to contact investigators at 1-888-579-1520, ext. 2783. Tips can also be passed on anonymously through Crime Stoppers at 1-800-222-8477.