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Otago University Students' Association communications manager Tess Trotter said about 2200 people attended the event.
''It's been a good night. Everyone's having fun,'' she said.
The event acted as a ''test run'' for the other events coming up this week and ''everything has gone really smoothly'', she said.
A St John spokesman said, by 9.30pm, paramedics were not required to treat anyone at the scene or transport anyone to hospital.
Acting Senior Sergeant Jared Kirk said only one arrest was reported in the student quarter by 10pm, that of a 19-year-old laboratory technician, who allegedly jumped on a car outside the University Oval.
No-one was evicted from the Toga Party, he said.
As students walked to the party, small quantities of eggs, oranges and flour were thrown by some of those on the street.
Outside the event, University of Otago vice-chancellor Prof Harlene Hayne greeted the students.