In the past, the Norlin Quad on the university campus has drawn anywhere from 10,000 to 12,000 people for the gathering, which takes place at 4:20 p.m. on April 20, according to CNN.
This year, in order to stop the event from going forward, university officials closed the campus to people who were outsiders and put a fish-based fertilizer on the quad, to give the area a bad smell. In addition, the quad was cordoned off with yellow police tape and guarded by officers, according to CNN.
"People fly in from around the country to participate. We don't understand why they have to come to (this) campus," University spokesman Bronson Hilliard said, according to CNN.
"I do not see any justification for the university shutting it down," said student organizer Daniel Ellis Schwartz, who said the measures infringe on First Amendment rights to protest. Schwartz suggested there also would be an off-campus protest against the university's measures to stop the event, according to the Huffington Post.