I've just seen the advert for the Thenay event in the 4L mag.
It says-
The first European gathering of the 4L
20 & 21 June 2009
Leisure centre at Thenay (41) to the south of Blois
All R4s and variations welcome, JP4, Rodeo, 4L Raid
Shops, Swaps, offroad course, slalom, 'bac à sable'
Renault R6...