Teams from Marist, Pirates, Ruapehu, Taihape, Utiku Old Boys, Ratana, Marton and Kaierau will be split into two pools to find two finalists.
Taihape first five-eighth and former Wanganui Heartland player Tom Wells has been appointed the Wanganui 7s rep coach and is also one of the selectors on Saturday.
Once named the rep side will train for the Hurricanes Regional 7s tournament being held in Palmerston North on December 6, with hopes of qualifying for the national competition later in the summer.
Pool A includes Taihape, Utiku Old Boys, Marist and Ratana, while Pool B features Pirates, Ruapehu, Kaierau and Marton.