Mr. Bannon has agreed to speak this month as part of Free Speech Week, a four-day event organized by The Berkeley Patriot, a conservative student publication. Mr. Yiannopoulos is also scheduled to appear.

Bryce Kasamoto, a Berkeley Patriot spokesman, confirmed that Mr. Bannon and Mr. Yiannopoulos would appear at the event, which runs from Sept. 24-27. He indicated that there would be additional speakers but said he could not name them yet because his group was “still working with the university and law enforcement to finalize our itinerary.”

Dan Mogulof, a spokesman for the university, said the event’s organizers had not submitted any of the information or forms required for the university to provide security: a description of the events, for example, and a police services request form. The requirements are outlined in Berkeley’s events policy, he noted, and “they just have not completed any of that.”