Sorry... the flyer and the website Groot Spoor Festival 2011 are in Dutch language only.
But I'm sure the picture slideshow of 2009 will show enough.
There will be several layouts, including live steam and some workshops.
Traders (Grootspoor.com and BigTrainworld.com and several others).
Also there will be a stand by importers "Hobbytime" (importer of Bachmann, Massoth and Pola) and "Scaletrading" the dutch importer of Piko G-Scale.
Also (only on saturday) there is a stand from TrainLine.