The Lawn, Whittlesford CB22 4NG. Beware of heavy traffic on the A505 around rush hour.
https://www.google.co.uk/maps/place/The+Lawn,+Whittlesford,+Cambridge+CB22+4NG/@52.1138583,0.1504835,17z/data=!3m1!4b1!4m5!3m4!1s0x47d87b7bad382fe5:0xbdf13e5e7be5938c!8m2!3d52.1138583!4d0.1526722 You can drive around the ground and park on the grass near the pavilion.