Yiannopoulos faced protests from left-wing activists and members of the extremist movement, antifa, when he visited the campus in February. Rioters set fires, smashed windows, and vandalized numerous businesses in downtown Berkeley. Several attendees of Milo's speaking engagement were assaulted on camera.
The violence prompted police to shut down the event and even elicited comment from President Trump, who suggested that the school be stripped of public funding.
Following the shutdown of his February event, Yiannopoulos vowed to return to Berkeley, which has faced criticism for suppressing free speech by allowing student activists to effectively perform a "heckler's veto" against speakers like Yiannopoulos and political commentator and author Ann Coulter, whose event was also canceled in April.