I recently took my crochet hooks on a trip with me in my carryon. My scissors got confiscated, so I bought some fingernail clippers (without the file) and have been using that to cut yarn when traveling.
I especially like what you did with the barrettes - great job! Are you going to other craft shows? I used to do the craft show thing (between college and grad school) - and some markets are really terrible, but others are just great. Don't give up!