The data in this study are recorded domestic and non-domestic assaults in New South Wales and Victoria on Wednesday nights (between 6pm Wednesday to 6am Thursday) for the weeks around rugby league State of Origin games. The data was collected over a six-year period (2012-2017) and includes every Wednesday from two weeks prior to the first game of each series to two weeks after the final game (11 weeks per year). The series typically spans May – July each year, although there is one Wednesday from August included. Data from Victoria was included as a quasi-control measure, given the substantially lower interest in rugby league in that state. It is important not to directly compare the assault numbers between NSW and Victoria due to different counting rules and data systems used in each jurisdiction – our main interest here is the impact of State of Origin on assaults in each state.