Battles!
Each player is paired with someone of their own Bending style to fight. They will go against each other in one of the region's games (for example, two Earthbenders/Sandbenders/MetalBenders would choose to either Earth Rumble, Earth Soccer, Elephant Koi Riding, Gliders, or dare i say racing in the Omashu mail system). Everything would be controlled by a GM except for the character's themselves. When it comes to the point when two people battle of different attributes, they can choose betweena Free Duel of a Weapon on Weapon duel.
The winner gets a Machinist's Glider.