It depends on the rule.
If you mean ban The Hunger Games, it was a lot of people. District 13 was already uprising, but needed something that would inspire the people to stand up against the Capitol. In the 74th Hunger Games, Katniss did several things that inspired the people, like her 'love' for Peeta, and covering Rue's body in flowers after she died. Her mockingjay pin became a symbol for the uprising. No-one suggested the rule as such, it was just a thing that everyone wanted. I suggest that you actually read the books, they are really very good, I would recommend them for anybody!
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The first rule change announces that two tributes can win, so long as they both are from the same district. This rule change was made because Panem citizens would be too crushed to see the star-crossed lovers of District 12 forced to kill each other. The second rule change is simply revoking the first change, so that there could only be one victor. This change is also very vital to the story, because it inspires Katniss and Peeta to perform their suicide stunt, propelling the story forward.
Katniss and Peeta. The gamekeepers change the rule so two tributes can win from the same district. In the Quarter Quell, everyone explodes the arena and escapes.
The Quarter Quell! In this, all the winning tributes from a district are put back in the drawing for the Hunger Games so that when the tributes are picked, it is from a pool of winning tributes.
A quarter quell is a special hunger games held every 25 years. They each have a special rule. For example, in the first quarter quell, the tributes were elected. In the second one, there were twice as many tributes. In the third one, the tributes were all former hunger games winners.
I am hoping that i understand your question correctly... 74- its the 74th Hunger Games 12- Katniss is from district 12 24- number if tributes in the games 13- the district that broke away from the rule of the capital