I wanted to experience pin trading my first time last time I went since it wasn't a thing when I went so long ago. I got some ones to trade before I left (from a friend who goes all the time). I saw pins on boards to trade at all the shops, but none had anything I was interested in. I didn't see any CMs or Characters with lanyards or pins. I was a bit disappointed honestly... but I was going to give it another shot since out last trip was too hectic and might have missed them. I did end up buying some great ones while I was there just to collect (as well as some over the web since I have been back)
That being said. A lot of people wear lanyards with pins

I am not sure if people trade with other visitors.. not sure if that is thing?