The workshop was led by Sergeant Keith Newell, of Queenstown.
He said the free workshops were run twice a year for all bar, door, restaurant and off-licence staff.
The workshops came about after a large number of complaints of assaults against door and security staff at licensed premises in Invercargill.
They were aimed at training staff how to deal with underage, aggressive and intoxicated patrons to reduce problems and improve profitability, he said.
Sgt Newell said staff selling alcohol should always ask for identification, and reminded them not to sell alcohol to anybody who was intoxicated or underage.
The workshops were held before the busy peak seasons.
"It's always good to meet those who work in the industry to discuss where the police are coming from, and what we have to deal with when things turn to custard," he said.
It was an opportunity for bar staff to ask questions regarding any difficulties they had when selling alcohol.
The Willows Tavern owner, Les Walker, attended a workshop yesterday.
He said it improved understanding of his obligations under the Sale of Liquor Act.
