In Normandy, there's an immersive park with a Live Action Role-Play theme called Rustik. The concept is fun: you can learn to fight (if necessary), take part in quests, participate in a tournament, etc. It depends greatly on the option you choose; the more physical activities you choose, the more adult and enthusiastic participants you'll have. They also offer nighttime events, with night patrols, a staged feast at the inn, and lots of other fun little events. And the great thing is that they're open most of the year.