Can you find me in the picture above? This was last weekend's Unicef 10K race.
Here, its all about image, so they require that participants in races like this all wear the same shirt so that the pictures look impressive. I have to admit, it does look really neat when the whole street is filled with blue.
I also ran, about four weeks ago, the Nike WeRun Bogota 10K. There we all wore bright coral shirts.