A crowd of people gathers under a massive overpass, likely for a marathon or race

A crowd of people gathers under a massive overpass, likely for a marathon or race. Many wear pink shirts with a visible logo. An overhead banner displays "NAIROBI ENTRY START BOX" and "WEAR BIG ON YOUR CHEST," along with start times. Colorful balloons add a festive touch to the scene. The overpass is concrete, with support beams and security cameras mounted on the underside. The sky is overcast.