Police said Monday that the 29-year-old victim was selling beverages at the festival last month when he was approached by a stranger.
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The suspect reportedly mocked the vendor saying, "children sell lemonade."
The encounter escalated and the suspect threw a glass bottle at the vendor's head.
The man suffered cuts to his face and was taken to the hospital with non-life-threatening injuries.
Police are searching for the attacker who ran away from the incident.
Anyone with information is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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