In WWE Smackdown vs. Raw 2011 for PS2, PS3, PSP, Xbox 360, and Wii, you can unlock the Tribute to the Troops arena by two different ways.
The first option is by cheat code. To enter cheat codes, go to My WWE, then select Options, then Cheat Codes. Put in the code 8thannualtribute to unlock the Tribute to the Troops arena.
If you don’t want to use cheats to unlock it, then you’ll need to win Wrestlemania with any superstar using regular matches in WWE Universe (custom matches aren’t allowed).