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Crowds of people emerged from stores to watch the unexpected cavalcade of 15 horses.
Promotor Andrew Hansen, from Event Pro, said the event was believed to be a world first, combining an equestrian spectacle with the sounds of the Hollies in concert.
With one of the richest show-jumping prizes in Australia and New Zealand, the $50,000 Super Grand Prix event had attracted a star-studded line-up of national and international equestrians, including three New Zealand Olympians and top jumpers from Australia.
In the Wall Challenge, riders would try to break the New Zealand show jumping height record of 2.13m, Mr Hansen said. An additional $70,000 cash prize was on offer for any rider jumping 2.21m.
The Equestrian Sports New Zealand Otago jumping and hunter championships will be held at the Taieri Agricultural Park in Mosgiel at the weekend.