Caldera has several contests of skill that can be melded into pro-bending, generally involving their Earthkin. As a player you are welcome and encouraged to expand on the scene, so long as you check in with us first so we can give it a look and approve it. I don't have any specific competitions planned yet that Caldera is doing, so feel free to start crafting some information that will work for your AU, if there are any problems we'll work with you to come to a good solution.