I think its important because district 12 has finally had a winner from their district. If prim participated in the game and Katniss did not volunteer, their would be a bigger chances that they would lose knowing that prim doesn't know how to fight and Peeta is not used to fighting. Also because of this, district 12 is finally recognized more by others.
This event is important because the tributes get some ideas on what the other tributes can do and it might help them to win the game. The game became more intense now that they know what to do and what to avoid from their fellow tributes.
Its important because Katniss and the other tributes shows more of their talent. Katniss shoots an apple on the pigs mouth. The game makers were amused that she have the guts to do that and because of that she got more sponsors that might help her to win. It is also seen as a sign of rebellion.
It is important because it affects Katniss so mush . she reminds her of her sister, Prim and treated her as her sister. it is like she looses a sister. She feels devastated and because of this it might affect how she play the game.
Its important because Peeta and Katniss doesn't have to kill each other. this event relieves Katniss because she does not have to kill him. This event affected Peeta because
Wait , wait. Ladies and gentlemen, may I present to you the winners of the 78th annual Hunger games.
It's important because this is how Katniss got her nickname 'The Girl-on-Fire' . She was loved by the people in the capitol. She got more sponsors that might help her to win the game. Also because of this she got more recognized.