From Longman Dictionary of Contemporary Englishon the occasion of somethingon the occasion of somethingformalHAPPEN at the time of an important event on the occasion of his second wedding → rise to the occasion at rise1(9) → occasion
Examples from the Corpus
on the occasion of something• In May 1985, on the occasion of the centenary, hundreds of people thronged the platform, many in Victorian costume.• Ragged urchins, of course, sitting on those school benches on the occasions of her visits.• Although it is not continuous, it is observed on the occasion of some miracles. 