Now that the horrible Hunger Games are over, nobody worries about their kids having to go into the Arena. It's been about 25 years since the rebellion and most people don't even know what the game are!
Kids learn a bit about the games at school but they don't go into detail until they reach the age of 17. Even then, they only study the rim of it instead of learning right through to the heart of the games. No one seems to care much about the games anymore...
But what happens when Katniss and Peeta's son gets kidnapped and both of their children find themselves in the arena?