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Queenstown police dealt with disorderly behaviour, arrests and assaults on St Patrick's Day or the early hours after.
Senior Sergeant Paula Enoka said police would rather have been out preventing crime elsewhere but were drawn into the Village Green to ``baby-sit'' about 350 people celebrating the event.
Although most people were well behaved, she said when large social gatherings and alcohol were combined there was always the potential for behaviour issues.
There were three alleged assaults. Two arrests were made.
The first incident happened before the sun had set when a 28-year-old local male had a glass thrown at his head in 1876 Bar and Restaurant at 5.30pm.
The man immediately took himself to the medical centre and received butterfly stitches to his head.
Police were waiting to view CCTV footage to identify the other man involved, Snr Sgt Enoka said.
A 23-year-old British man was initially removed from Winnie's Bar and Restaurant by security staff for alleged disorderly behaviour. He was then arrested after allegedly spitting, headbutting and repeatedly trying to punch the bouncer.
He was charged with assault and will appear in the Queenstown Lakes District Court.
A 27-year-old man was caught allegedly urinating in Horne Creek, which runs through the Village Green, at midnight. Police said he then attempted to run away from officers.
He was arrested and will appear in Queenstown's court on charges of indecent behaviour and resisting police.
Another man (47) was left with a bleeding nose after allegedly being headbutted by another man outside Church Street Night 'n Day at 3.45am on Sunday.
He did not require medical attention and police were waiting to view CCTV footage to try to identify the other man involved.
Snr Sgt Enoka praised local bars and their security for vigilance and for having extra staff rostered on.