The situation got out of hand when the festival organisers couldn't foresee that the mob would get angry because they were stopped from taking the offerings.
Once you have been accepted as a pupil or student at the school or college, it's against the law for them to discriminate against you because of your religion or belief.
The Indigenous experience, like with any form of belonging, is highly fluid and context-specific, meaning there are countless examples of what such cultural pluralities can look like.