Task: Question Answering
Input (English): Context: There were people who had laid tarp on the muddy ground close to the stage to watch the concert . But everyone had to keep stepping over these people and their tarp to get closer . It was a bad spot for these people to set up to sit down . My aunt and uncle crashed at my place for the weekend , since they were seeing the concert too . 
Question: Why was tarp placed on the ground ?
Output (English): It had just rained and left the ground wet .