Back on topic
Not Kent but down in Hastings East Sussex so might not be that far depending on where you will be exactly, 1066 racing, not sure of their dates over xmas, check the Facebook page for meetings and scroll down for a couple of recent track videos
https://www.facebook.com/1066racing/?fref=ts
Martime as mentioned, I have only been to the circuit part but am told the buggy bit is just as good