The three MPs competing for the leadership of the Labour Party will visit 11 centres in the next two weeks as they campaign for votes.
David Cunliffe, Shane Jones and Grant Robertson have put their names forward to replace David Shearer, who stood down last week.
MPs, party members, and unions affiliated to Labour all have a vote on the leadership.
A dozen candidate meetings will be held around the country, starting in Levin on Saturday.
Party president Moira Coatsworth expects large turnouts at the meetings, now there is a three-way race for the leadership.
"There's a great deal of interest from members and I think we're going to have a very dynamic fortnight."
List MP Maryan Street, who would have moved a motion of no confidence in Mr Shearer if he had not stood aside, is backing Grant Robertson for leader.
Mangere MP Su'a William Sio signed Mr Jones' nomination form but says he will vote for Mr Cunliffe, because he gave him his word he would do so.
The new leader will be announced on 15 September.
Meanwhile, government MPs dubbed the contest Parliamentary Idol during Question Time on Tuesday.