at my old home town in Germany we had a weekly car meeting for every tuning lunatic. the came from around 50 KM around on nice weather.
Why not start something like this in Northampton. its quite central. just need to find a day (Wednesday?) and a place where you can fit a lot of cars. maybe some supermarket of something else that's closed after 8-9 o'clock.
found a place some people spread the word to car fanatics and here we go - a nice weekly meeting