User blog comment:ArleneLove'sTHG/Forever:5th book of The Hunger Games/@comment-208.168.225.150-20130620003027/@comment-4749291-20130622085101

District 13 has brought a smaller version ofall the dirsticts in one. They use these mini-districts in their own games. Katniss did not know about these games because they only happened for District 13.

I hope this helped!

If not, then think of District 13 as the USA. All the districts in one and in control.(states in the US are the district in Panem) :)