definitely recommend Broxtowe's outdoor track on a friday night
There is also West Bridgeford whom race buggies on grass near Bingham on a friday night... will be trying them this week.
A1 Racing Club near Grantham race on a tuesday evening on a brand new outdoor astroturf track.. its a bit of a trek from Derby but i do it every week as i'm one of the organisers and built the 1/10th track so depends how keen you are!
Mark.