Hi Luke,
I am planning to attend as well and had a search of the forum.
There have been a few other events at the Cumnock site and there were some directions attached to those as follows:
"post code for site is ka183jn get close and follow the arrows"
I'm sure there will be official directions soon.
Looking forward to the day (although not the fuel bill running the V8 from Falkirk and back again!)
Andrew.