Police have been working all week to make sure the event remains safe.
"This is an ongoing process," Olathe Police Sgt. Bryan Hill said. "We have an in depth action plan in place, and we're currently reviewing that so that it's current, appropriate and that everyone is going to be safe."
Runners and race fans are encouraged to remain vigilant. Many said they still have Boston on their mind. In fact at Saturday's race in Olathe will begin with a moment of silence in remembrance of that city's loss and its resolve.