I quote
Peterborough’s fifth Classic and Vintage Vehicle Festival will take place on The Embankment on 1 and 2 September 2018. The event is growing with each year and in 2017 it attracted more than 500 vehicles and more than 3,000 visitors from all over the region and further afield.
This is a fun filled weekend for all the family where there's plenty of variety on display for the enthusiast including cars, motorcycles, scooters, commercial vehicles, agricultural vehicles, buses and military vehicles.
https://www.peterborough.gov.uk/residents/leisure-and-culture/classic-and-vintage-vehicle-show/
We have been for the last few years, its on the meadows not far from the river and the Nene Valley Railway.