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Event comes from Latin ēventus ‘an event, occurrence’, from ēveniō ‘to happen, to fall out, to come out’, and ultimately from Proto-Indo-European *gʷem-.

1. Proto-Indo-Europeanc. 4500–2500 BCE*gʷem-¹‘to come’reconstructed
2. Proto-Indo-Europeanc. 4500–2500 BCE*gʷm̥yéti²‘to come’reconstructed
3. Proto-Italicc. 1500–700 BCE*gʷəniō²‘to come’reconstructed
4. Latinc. 75 BCE–200 CEveniō³‘come’
5. Latinc. 75 BCE–200 CEēveniō³‘to happen’
6. Latinc. 75 BCE–200 CEēventus³‘an event’
7. Middle Frenchc. 1400–1600event³
8. Englishearliest quotation c. 1603–1604event³

1. ¹ Wiktionary, Proto-Indo-European *gʷm̥yéti
2. ² Wiktionary, Latin venio
3. ³ Wiktionary, English event
4. Earliest quotation in Wiktionary’s entry: c. 1603–1604, William Shakespeare, Measure for Measure: “Leave we him to his events.”.