At least one Omicron case has been confirmed at the three-day event, and many more are feared.
More than 100 students from Auckland Grammar went to the festival and have been ordered to isolate at home until they produce a negative test.
Other schools are advising their students to take the same precautions.
Auckland Grammar Headmaster Tim O'Connor told Tim Dower it's a no brainer.
“I’d rather have students off one or two days while they get a negative test result than having to shut down either an entire cohort or large groups.”
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