Let's take your original sentence and transpose the definitions and see how it works out, shall we?
This year a friend and I are dawning our Team Rocket uniforms and heading down to seattle on a bus with no place to stay once we get down there. It will be awesome.
donning
This year a friend and I are "putting on the clothing of" our Team Rocket uniforms and heading down to seattle on a bus with no place to stay once we get down there. It will be awesome.
dawning
This year a friend and I are "starting or beginning" our Team Rocket uniforms and heading down to seattle on a bus with no place to stay once we get down there. It will be awesome.
If you really meant that you are going to start your uniform, and then go to Seattle with costumes that were only partially completed, then the second sentence was correct. I doubt that it what you intended to say, however.
Most people admit when they make a homonym error, but you continued to fight it. I am an English major, you will never win a semantics, spelling or grammar argument with me.
/thread