context: Thick clouds masked the sky for the Braun sponsored event as the crowd looked up at the raised platform while a small group of bike stunt riders watched one rider land on his feet while his bike was still in the air.
hypothesis: There is little chance that a group of bike stunt riders are at an event.
valid_hypothesis: It is certain that a group of bike stunt riders are at an event.
invalid_hypothesis: There is little chance that a group of bike stunt riders are at an event.
hypothesis_assertion: A group of bike stunt riders are at an event.