Eden Park says it will struggle to stay commercially viable if vaccination rates in Auckland do not get close to 90 percent. As the prospect of summer crowds and concerts draw closer, major events are mulling how to keep punters Covid-19-free. For now, the country's largest ground has stopped short of saying it will require proof vaccination before entry. But it says promoters looking to use venues may have rules of their own. Our reporter Nick Truebridge and cameraman Nick Monro have the story.