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The college’s ball was held on Friday night for its 200 residents.
Concerns had been raised by some University of Otago students about the fact the ball was going ahead while other colleges had cancelled their events.
Warden Luke McClelland said only Selwyn residents were involved, and those who attended "really enjoyed themselves".
The ball took place within the college.
"Some of the residents would have loved to have had their partners attend, though everyone knew and respected the fact that the event was for Selwyn residents only.
"We experienced no issues whatsoever."
As had been the case since the start of the lockdown, all external gates and doors had been locked, he said.
"QR codes are in place to contact trace anyone like contractors coming on to the site.
"We’ve had other control measures in place, including mask-wearing by staff/contractors, increased hand sanitisation and cleaning of high-touch surfaces, residents self-isolating and getting tested when unwell."
Mr McClelland previously told the Otago Daily Times the Selwyn College organisers had taken advice on running the ball, and had planned well to ensure it did not breach any of the Covid rules.