Simplify the following text for a Grade 4 native English-speaking person.
Original: On September 9 , 1916 , the Speedway hosted a day of short racing events termed the Harvest Classic , composed of three races held at 20 , 50 and 100 m distances .
Simplified: These were called the Harvest Classic . There were three races held at 20 , 50 and 100 m distances .