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Second-semester lectures for returning students also began yesterday.
The three-point basketball contest was one of the first events of Re:Ori and involves participants attempting to make as many three-point field goals as possible in one minute.
Students could enter every day, as a new competition was running until Friday.
Today, students will be given tips on how to look after themselves during the colder months at a winter wellness event, involving the Dunedin Curtain Bank, Cosy Homes Trust, All Saints Fruit and Veges and support services for students, and later in the week the Charity Fight Night - where student boxers raise money for charities of their choice - will be held.
The annual clubs day takes place tomorrow.
An OUSA spokeswoman said drug testing by KnowYourStuffNZ and the NZ Drug Foundation was also returning for Reorientation Week, and a marquee would be set up in the OUSA Clubs and Socs building staff car park on Albany St tomorrow and Thursday.
Mitch James will be performing today, while later in the week artists including Sachi, Upgrade and Lee Mvtthews will take centre stage.
The International Food Festival, which includes food from different students' associations, will be held on July 14, from 4pm to 7pm, outside the university staff club.