Protesters, some wearing keffiyehs, gathered outside the venue, chanting "No Trump, No KKK, no fascist USA."
The demonstration reportedly turned violent when a man selling memorial t-shirts for Turning Point USA founder Charlie Kirk, who was assassinated two months prior, clashed with protesters.
Two people were arrested for battery by the City of Berkeley Police Department following the incident.
Turning Point USA staff accused the protesters of being Antifa, while the university affirmed its commitment to supporting all speakers' rights.