Basicly i have had this idea for awhile now. What it is a practice house for events it would worked like ctf were you would pay a certain amount of graalts (lets say 5 graalts) and there would be portals like the ctf one and it would warp you too events such as bush , ice , run and jump ,dodge, sumo (you could for sumo add enermy ai too replace the players) however chance well you dont need too practice it.

On a side note you could add a timer too any of these events too see how qucik you have done it and you could add a leaderboard of the quickest  

Not a bad idea, but you can all ready buy furniture and set it up in a house layout that has water to practice bush races. If you wanted to you could probably set it up so that players have to use bombs to gain access to your bush race course and get them to "farm" for you a little bit and host races and give gralats as prizes. My guild leader has a nice coarse set up at his guild house that we all practice on.