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[Formal] On the occasion of / When... (special, one-time event).
When starting a new business on the occasion of it, we investigated thoroughly.
[Formal] On the occasion of... (momentous start).
An exhibition prior to the release of the new product was held.
The festival was held over the period of one week.
The meeting continued over a span of three days.
During the holidays, the highway was congested for dozens of kilometers.