The Reaping is where two tributes are selected for Hunger Games. Once Prim was chosen for this year's hunger games, Katniss got out of line and shouted to be a volunteer. This proves how strong Katniss's relationship is with her family and this also the start of Katniss's hunger games career.
The opening ceremony is the first official time the Capitol has seen the tributes, Katniss wore a flamable outfit which made her popular. The crowed loved her and Peeta, which made Katniss able to get sponsors more easily during the Hunger Games.
The training center is where Katniss did the game-maker interview. Katniss got pissed and shot an arrow at the Gamemakers. The Game-makers where impressed, but President Snow thought it was a rebellion to overthrow his power at the Capitol.
When Katniss blew up the food supplies, she heard Rue yelling in the distance as she got trapped in a net. Katniss ran back and helped her, but when she got freed she got speared by Marvel. Marvel then got shoot and killed by Katniss. This was important because thresh spared her when she was getting medicine for Peeeta at the Cornucopia.
Three tributes remain in the hunger games, Katniss, Peeta, and Cato. The Game-Makers sent some mutant mutts at the three remain tributes. they all took shelter on the cornucopia, where they all fought. Cato eventually falls off the Cornucopia and then got eaten by the mutts. this was the climax of the hunger, and knowing that Cato died the Star Cross Lovers still continue in the capitol.
Near the end of the Hunger Games, Katniss came up with a idea to ruin this year's Hunger Games by committing suicide with Nightlock Berries after the Gamemakers changed the rules and said that there can only been one victor. Under pressure the make makers said to stop and announced the new Hunger Game victors. This was a big importance to the hunger games story, because This event supported president Snow's hatred for Katniss.