The alleged offender, a 19-year-old man, fled before police arrived but was later arrested this morning without incident.
He will appear in the Whangārei District Court tomorrow charged with assault with a weapon, and wounding with intent to cause grievous bodily harm.
Pilmer said police would like to hear from anyone who was at the party and may have witnessed the assault.
You can update any information by calling 105 and referencing number 250101/1125.
Information can also be provided anonymously via Crime Stoppers on 0800 555 111.
Brodie Stone is an education and general news reporter at the Advocate. Brodie has spent most of her life in Whangārei and is passionate about delving into issues that matter to Northlanders and beyond.