"What we've been finding is that while responsible partygoers have a few drinks and then go home either with a safe driver or in a cab, a minority want to carry on long after they should have called it quits," she said.
She said police usually arrest about 24-28 people over a weekend, but last weekend had to deal with many more offenders who were much more intoxicated.
Police said people holding functions should make sure they have food and non-alcoholic drinks available.
"Another is that instead of spending social club funds solely on alcohol, consider funding entertainment or a safe way for everyone to get home," said Grace.
"That way people will stay at your function longer and then arrive home in one piece - ready to resume work in the New Year instead of managers having to replace a friend or workmate because of an avoidable tragedy."
- nzherald