CLEAN : FILE Jamaican sprinter Usain Bolt

The video begins with a cheering crowd and an announcer speaking. A discussion follows about the performance, comparing it to previous ones. The scene shifts to a welcome back to Rio, with personal reflections on the location. Finally, an announcement is made about an upcoming 100 meters event.

What can be inferred about the atmosphere during the event based on the cheering and clapping?

What event is being referred to when mentioning '100 meters'?