More than 20,000 people are going to be at Camden Yards on Saturday for the Color Run.
The unique paint race celebrates healthiness, happiness and individuality.
There are no official times or winners, there is just one rule. The runners must wear white and prepare to be covered in color at the finish line.
It's fun, but the Color Run is also a way to give back.
The organization chooses an individual charity to donate to in each city. Baltimore's charity is Cool Kids Campaign, a charity that helps kids with cancer, and their families.
This is the first time the Color Run is making a stop in the Charm City.
The race is on Saturday at 9 am and 2 pm.