Crate Day was started in 2009 by a radio station.
Those participating in the early December event are encouraged to try and consume a case of 12 large 745ml/l bottles of beer, which contain 300 grams of pure alcohol.
A study published today in the New Zealand Medical Journal looked at shootings during Crate Day in the Waikato in 2019 and 2020.
It found 57 20- to 24-year-olds presented with ED, compared with 29 over a reference period.
The same was true for ages 25-34, from 14 to 29 years.
Seventy-two percent of alcohol-related presentations at Waikato Hospital ED were male.
According to the study, Crate Day was a public health concern because of the potential alcohol-related harm from increased consumption.
There were no statistically significant differences in gender, ethnicity, hospital or deprivation between the Kratdag period and the reference period.
The study said it highlighted the burden of alcohol consumption and binge drinking on EDs.
It focused on the media, saying that broadcast media should value their significant and lasting social impact and ensure that internal policies and culture resulted in content that discouraged harmful use of alcohol.