I will refer you to...
http://www.yaoicon.com/content/view/75/161/
That!
Wooden, leather or plastic paddles, bats or any similarly designed implements may NOT be brought to the convention. If you are found with one you will be asked to return the item to your room. Failure to do so, complaints about your use of an implement while on convention premises, or repeated infractions may result in your convention badge being confiscated (and you sent home).
You may want to bring it to be safed and see if it's good or no? I'm not sure. I know I won't be bringing a keyblade for my Sora costume, but that's just me.