Organisers are hoping this year's Protecta Insurance River City Park Up builds on the success of 2017's inaugural event.
Wanganui City College grounds will become a sea of cars from 10am this Sunday for the annual event which the Wanganui Road Rodders debuted in 2017.
"We're really looking forward to it and the weather's going to be good," organiser Grant Rivers said.
More than 500 vehicles attended last year's park up and Mr Rivers hoped there would be more for the second edition with vehicles of various types coming from across the North Island.
The River City Park Up also includes food stalls, face painting and trade displays.