The IMT Des Moines Marathon will hold a group run/walk on Saturday morning to honor those affected by the Boston Marathon explosions, The Des Moines Register reported.

No registration is required; anyone is welcome to show up at Nollen Plaza at 7:30 a.m. A moment of silence will precede the run, and participants can choose a six-mile run or one-mile run.

Also, organizers of Saturday night's Glow Run 5K will hand out blue ribbons for participants to pin to their t-shirts.