You have to get amateur online status
I don't know how to get that but i
Chat with our AI personalities
Complete all challenges and films n it will unlock
not
all you nee to do is do MOST of your skate 3 missions and after it dose all that stuff it wil tell you that you have unlocked the xgames arena this worked for me
to unlock big black type in "letsdowork" at the cheat code section of the game
defeat hall of meat challenges until you unlock it