Auckland businesses are gearing up for a busy Wednesday next week - as hotel occupancy reaches 100%. 

Forty thousand are expected from Metallica fans alone, with the rock band set to perform at Eden Park. 

Meanwhile, nearly 3,800 international delegates are gathering at Aotea Centre for New Zealand's largest ever academic conference, celebrating Indigenous education over five days. 

Auckland Unlimited Destination Director Annie Dundas told Mike Hosking the city will probably average 80-85% occupancy over the summer. 

She says these nice big event spikes lift them up for certain parts of the year, giving the accommodation and hospitality sectors a boost.  

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