The Napier City Council says it was "let down" by a third party who sold two beers to a minor at McLean Park in February.
The council was discharged without conviction yesterday after pleading guilty to the charge in the Napier District Court last month.
Napier City Council sport and recreation manager Glenn Lucas said the council took its responsibilities under the Sale of Liquor Act "very seriously".
"We were extremely disappointed that this incident occurred, and that we were let down by the third party we contract in to manage our bar operations,
"We've worked very closely with that third party since the event and we have faith in the steps now in place to ensure good host responsibility."