Everyone dresses in white, and at 5 stations along the course, they have volunteers throw colored corn starch at the runners, so when you're done, you look like a giant tye-died person. They give everyone a packet of color at the start to throw around too.
So, here's what I looked like at the start of the race
There were multiple "waves" of start times, and this is what the start looked like from the registration line.
This is what I looked like when I was done.
It was tons of fun. I have no idea what my race time was, but I ran for the first time without music. It was so much fun to see all of the other runners. There had to be at least 10,000 people. It was a wild day.