CHICAGO (CBS) — Organizers of Sunday’s Chicago Marathon are preparing for lots of runners and spectators to make their way through downtown Chicago and the city’s neighborhoods.

CBS 2’s Lauren Victory reports on another run ahead of Sunday’s event.

On Saturday, the annual Advocate Health International 5K. It’s a tradition that happens 24 hours before the big race. Family and friends of runners participate as do some runners who want to get in a final workout.