The dates for the 2019/20 HSBC World Rugby Sevens Series are yet to be confirmed.
NZR were talking to World Rugby and the Fiji Rugby Union about hosting the event in Fiji during the 2020-2023 cycle.
World Rugby confirmed the move with the women's season set to expand to eight rounds for the first time.
Hamilton will host a combined men's and women's rugby sevens tournament from next season.
The Women's Sevens World Series will be increased to eight tournaments from six, and of those eight, six will be combined with men's events. "This further reinforces World Rugby's confidence in Singapore to host world-class events", Oon added. Nielsen research recorded a 39-per-cent increase in live broadcast audiences across both men's and women's series, from 9 million in 2017 to 12.6 million viewers in 2018.
"We're happy to share it with Fiji - the team and its fans have helped make the tournament incredibly successful in Hamilton".
The men's season for the next four years will also feature standalone legs in Vancouver, Singapore, London and the United States.
"We are delighted to see the women's series expand to eight rounds over the next four-year cycle, an historic move that will provide more high quality competitive worldwide playing opportunities for women's sevens teams, a core strand of our Accelerating the Global Development of Women in Rugby plan".
Hamilton will continue to be the host city for the New Zealand leg of the HSBC World Rugby Sevens Series, with the 2020 event expanded to include a full womens tournament.
"We are delighted to see the women's series expand to eight rounds over the next four-year cycle, an historic move that will provide more high-quality competitive worldwide playing opportunities for women's sevens teams".
Chad Hooker, Operations Director for the Council's H3 division - responsible for management of FMG Stadium Waikato - says sharing the tournament with Fiji reflects the energy and passion the Pacific Island nation brings to sevens rugby.
This means that while Hong Kong will host a combined series round, Singapore will continue as a men's standalone round after the Southeast Asian nation earned the venue rights for the series during its expansion in 2015.
In an effort to deepen the talent pool, Rugby Australia will also look to recruit more athletes to compete in the 2019 Aon University Sevens Series. "We are looking forward to seeing continued growth and evolution of the world series in each territory over the next four years".
The Rugby World Cup Sevens was held in San Francisco past year.