Since we are on HN you should make it some what technical in nature. Blinking lights on your costume but if someone was to look at the lights it would be blinki

Since we are on HN you should make it some what technical in nature. Blinking lights on your costume but if someone was to look at the lights it would be blinking in Morse Code "Free Hong Kong!". Or discrete QR codes you put on your costumes and try and put them if front of as many cameras as possible. The QR code of course leading to your website of choosing. I am sure there are lots of neat ideas smarter people then me can come up with. Good luck.