After the haka, Ms Kaipo said it was different as she thought people could join in midway through the event.
Kelly Cameron is one of those volunteering at the matches and said a flash mob was perhaps Whangarei's worst-kept secret.
Kaari Schlebach, one of the organisers, said the idea behind the haka and other activities around Whangarei came from a group of residents who felt it would be great to involve the community in welcoming the teams and officials to the district.
The group has decorated Whangarei Airport and the Cameron St Mall and today, it would organise a post-match non-alcoholic function in the mall where a local band would play.
"The teams have not only been welcomed by officials of the tournament but by the heart of the community which is the people," she said.