It's offered throughout the cruise, we saw Cms wear pin trading lanyards throughout the cruise at Cabanas, shops and guest services. Also all the shops have a pin book you can flick through. Officer pin trading is a great event don't miss it!! We got lots of big pins, Limited edition pins and even some from the inaugural cruises!!
A fun event, but I does get crowded, try and stay for the whole event though cause they change per lanyards alot and bring new pins out.
Happy Trading!!
Shannon