Defending champions Auckland, national champions Wellington and Taranaki are likely to contest the men's finals with plenty of local support in the expected for Bay of Plenty.
Coach Peter Woods said today's tournament would likely help decide the final side for next weekend, with the squad of 22 to be trimmed down to 12 players.
"It is the last trial opportunity for the players," he said. "I would have loved to have taken about 16 players [to Mount Manganui] but we are only allowed to take 14 this weekend."
He said hosting the nationals in the Bay added both incentive to do well and pressure for the players to perform.
"I would say it is a lot more pressure at home in terms of support, with your family and friends watching, but on the flipside you are hoping it lifts the boys, so it can go either way."
In the women's competition, defending tournament and national champions Manawatu are strongly favoured to win again with a number of New Zealand reps, while an emerging Bay of Plenty women's side look to continue the gains they have made over the past few seasons.
Event sponsor Bay Engineers Supplies have been involved as Bay of Plenty Rugby's sevens partner going back 25 years since the birth of the then Whales tournament held in Whakatane.