On Wednesday, York Regional Police released a surveillance video of the incident and are asking for public assistance in identifying the man.
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It happened at a wedding on Saturday, Nov. 8, at approximately 12:15 a.m.
Police say the boy suffered serious injuries and was transported to hospital. The police were called, but the man left the scene before police arrived.
The suspect is described as a white male, who is 25 to 35 years old, six feet tall with a thin build and short, dark hair.
Investigators are looking to speak with anyone who may have been at the wedding who has not spoken with police yet or anyone who recognizes the man.