The Supreme Court has said that public entities like UC Irvine have discretion in regulating the “time, place, and manner” of speech. The right to speak on campus is not a right to speak any time, at any place and in any manner that a person wishes. The campus can regulate where, when and how speech occurs to ensure the functioning of the campus and achieve important goals, such as protecting public safety.
When it comes to high-profile speakers, UC Irvine invokes this necessary authority in order to hold events at a time and location that maximizes the chance that an event will proceed successfully and that the campus community will not be made unsafe. The campus heeds its police department’s assessment of how best to hold safe and successful events. The campus might invoke its time, place and manner discretion, for example, to ensure that an event with a high-profile speaker would be held in a venue that the campus police believes to be protectable (e.g. one with an ample number of exits, with the ability to be cordoned off, without floor to ceiling glass, etc.).
The need to consider time, place and manner regulations is the reason that we require students and other groups to work with the administration when setting up their events, as opposed to scheduling and creating the events on their own without campus input.