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McHardy (35) works as a driver at Passenger Transport and he will take a busman's holiday to volunteer his services during the massive event.
There are about 1600 athletes, coaches, managers and helpers staying at seven of the University of Otago residential colleges.
''My job is to drive the shuttle buses from the residential colleges to the sports venues,'' he said. He will also be an official at tenpin bowling.
''I have helped out at a smaller level in regional events. But nothing as big as this before.''
McHardy became interested in Special Olympics 10 years ago when he went along to watch some of his friends in action.
''I was encouraged to help out in different sports. It's been fun.
''I have made new friends and I enjoy comparing the different types of abilities shown by the different players. I get on with a lot of the athletes.''
It is the first time McHardy has been involved in a national event and he is excited about it.
The National Summer Games is the largest regular sports event for people with intellectual disabilities in New Zealand. It starts on Wednesday and runs until Saturday.