November 2 to November 4 is Guitar hero weekend. Xbox.com is giving away a few prizes but you need to sign up for them. Head over to http://www.xbox.com/en-US/games/g/guitarhero3legendsofrock/gh3weekend/default.htm to sign up.
I've created a Band/Group on guitarhero.com. I'm not sure what it's good for but you can join it.