Minecraft Hunger Games are based on "Hunger Games" series. Players must survive until there is one man standing, and usually start out with kits, which may contain food or weapons or potions.
So where do you go to play? If you go to the world spawn and look up at the direction signs. You will head South West to the Game Hub, once there you will have to locate the Hunger Games section of the hub (Green Glass) and enter the portal! It will spawn you in the loading area...