B1 anything that happens, especially something important or unusual: This year's Olympic Games will be the biggest ever sporting event. Susannah's party was the social event of the year. The police are trying to determine the series of events that led up to the murder.Events and occurrencesAccidents and disasters B1 one of a set of races or competitions: The women's 200 metre event will be followed by the men's 100 metres.AthleticsParts and stages of competitions in the event UK › used to emphasize that what happened was not what you expected: We had expected to arrive an hour late, but in the event we were early.Not expected or planned in the event of sth C1 if something happens: In the event of a strike, the army will take over responsibility for firefighting.Occurring and happening in any event C1 (UK also at all events) › whatever happens: I might go home next month, but in any event, I'll be home for Christmas.Occurring and happening in either event › in either of two situations: I can't decide whether to accept the Cambridge or the London job, but in either event I'll have to move house.Occurring and happening in that event › if that happens: There's a possibility of my flight being delayed. In that event I'll phone to let you know.Occurring and happening