Lets see... "event" is countable, and you're giving one as an example out of the many events which exist (and may exist). So yes, you must use "an" here.
"Why would you listen to music at an event?"
27 juni 2013
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!