I would think that it would be allright to wear inside the convention. However you should probably take a bag or something that you could put it in for going outsidE. I would also consider labeling "prop" on the bag just incase a cop stops you for whatever reason. That was advoce given to my video production mentor who did it the wrong way and got arrested. He went to work carrying an M-16 on his shoulder. Unfortunately for him his offfice building was renting out space in the same building as a bank so the cops and FBI showed up and stormed the building. Luckily (and unluckily) I missed it because I didnt go in that day to do any video editing.