Earlier today police said they had charged the man with wounding with intent to cause grievous bodily harm.
The Herald has reported that a guest was allegedly assaulted with a champagne flute at a party in Westmere on Friday night.
More than a dozen police cars flooded the normally quiet Rawene Ave in Westmere on Friday after the incident at a party attended by several dozen of the city's property and financial elite.
The event was at a property in Rawene Ave that was crowned NZ Home & Entertaining Home of the Year in 2007.
The party's host, builder Mark Ensom, was credited by witnesses with saving the victim's life after he staunched the severe bleeding while waiting for emergency services to arrive.
The victim was taken to hospital by ambulance with critical injuries but has since been discharged.
Police were unable to comment further as the matter was before the court.