hidden in trees and around the borders of the arena, they don't really mention it allot but they are probably hidden in bushes and things
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Because there are cameras already in the arena :)
Cornucopia
If you mean when they are in the arena, it is the bloodbath.
they go to the capital city, where they get groomed and trained for the upcoming hunger games. then, they are lifted into an arena, where they have to fight for survival. sources: watched the movie
In the Hunger Games, the Capitol issued the Treaty of Treason, which states that as a reminder of the rebellion, each of twelve districts would send one boy and one girl to compete in the Hunger Games and fight to the death in an arena on television.