Six60 Live in The Park is now a fundraising event for the Kaikoura earthquake-relief effort.

Kiwi band Six60 will headline a concert in Christchurch that is doubling as a fundraiser for North Canterbury earthquake relief.

Up to 10,000 people are expected at Hagley Park on Saturday for Six60 Live in The Park, featuring some of New Zealand's best musicians.

All profits are being donated to the Kaikoura relief effort, after organisers decided to double capacity and offer two-for-one tickets.

N/A Last year's Live in the Park event. All profits raised from the event this year will be donated to Kaikoura's recovery following Monday's 7.8 magnitude earthquake.

"We only came up with this thing on Tuesday night and [Wednesday] was just a scramble to get all the stakeholders on board with the concept," team event director Callam Mitchell said.

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"Christchurch has a strong legacy of using music as a way to join together in the wake of disasters."

Bevan Triebels All profits raised from the event will be donated to Kaikoura's recovery following Monday's 7.8 magnitude earthquake.

The Christchurch City Council organised Band Together soon after the 2010 quakes, while the Student Volunteer Army put on The Concert in 2012.

"No-one knows better than Cantabrians what the people in Kaikoura are going through. This is our way of showing we continue to be united in adversity," Mitchell said.

Organisers had to redesign the site of the event to cater for the larger crowd, as well as hire more bar and toilet facilities, he said.

All profits from ticket and bar sales will be donated. Performers and suppliers have also committed to donating to the cause.

Organisers had not decided which organisation the money would be donated to, Mitchell said, and hoped to announce that at the gig on Saturday.

The Christchurch City Council has donated the venue hire fee.

"Hagley Park is a special place for Cantabrians for many reasons, including the fact that people gathered there as a place of refuge after the Christchurch earthquakes," council head of parks Andrew Rutledge said.

"So it is fitting that we are able to donate the park fees from this event to assist with this generous fundraising drive for those affected by the earthquake in Kaikoura."

People who have already purchased a ticket are eligible to receive a complimentary ticket. They can log in to their Dash Tickets account to redeem their free ticket.

Six60 Live in The Park on November 19, from 2.30pm-10pm in Hagley Park. The lineup will include Six60, The Black Seeds, Kings, L.A.B and Downtown Brown with Laughton Kora.