When the Mission Concert was cancelled NCC decided it was important to offer entertainment for visitors still travelling to the region.
People had paid hundreds of dollars in flights and accommodation and should still be able to see some great music, he said.
NCC event manager Kevin Murphy said the concert would provide terrific entertainment for tourists as well as locals.
Napier would be very busy this afternoon with the concert, which was expected to draw at least a couple of thousands, as well as a large cruise ship docked at Napier Port, he said.
There will be some traffic management because of this and people will need to be patient.
Hawke's Bay Tourism general manager Annie Dundas said the concert adds to an already exciting weekend for tourists with Horse of the Year as well as plenty of bars, restaurants, cellar doors and cycle trails for people to experience.
"I'm super excited about Napier Rocks, it will be a great concert."
The event kicks off at 3pm with street performers and food trucks on Marine Parade (which will be closed to traffic for the event).
Concert-goers are then encouraged to grab a spot and set up camp at the Napier Sound Shell for the music which will start at 3.30pm with Mixtape and end with Jason Kerrison and band finishing at 8pm.