С вопросами обращайтесь к организаторам ивента (можно их найти по ссылкам). Кроме того, что поделилась нижеуказанной инфо больше ничем не могу помочь

Berry Champ de Bataille, the biggest french Wargame Live opens up registration to foreigners!
When is BCB 2011?
The 26th (welcoming, check), 27th and 28th August 2011 (Wargame)
Where is it?
In Menetou-Salon and Achères (18), France. 02° 28' 13.9'' E/ 47° 13' 31.5'' N
Where to register?
Go to http://www.berrychampdebataille.fr/ and then Inscriptions
Where to get infos?
Go to http://www.berrychampdebataille.fr/ and then Forum > Campagne BCB 2011 > Informations > BCB-Foreign Office
Registrations close on July 31st, reception of payment is proof of timely registration.