@Edent not very high tech, but in the past (2010) it did help me a lot to have Ubuntu stickers on my luggage. It allowed me to connect with people I didn’t know before, that were going to Ubuntu Developer Summit or similar conferences. Maybe something to attach on the bag? Like “attending #BubuCon ? Let’s chat!” 🙂
I know… it’s not visible to everyone nearby but it would be something. bubucon