Abstract: At 5:21 p.m. on November 23, 2019, an employee was working as a hoist and winch operator for a building finishing contractor. He was working at a trade show. Riggers were taking down a truss. An employee of another company was moving a sign and accidently struck the employee in the head. The employee experienced nausea and dizziness, but he did not suffer any serious injuries. He was hospitalized and held for observation. Before he could be released, the attending physician determined that he had an underlying illness requiring hospitalization. No measurements were taken of the worksite, because the trade show materials had been completely dismantled and removed by the time of the opening conference. The manager was onsite but did not directly observe the incident. No accident-related citations were issued.