Question

What was the first national event covered by a radio station?

Answer 1

The first national event that was covered was the 1921 Baseball World Series

This came three years before the presidential convention that is also found often as an answer, but an incorrect one. It was a match between the New York Giants, who are nowadays known as the San Francisco Giants, and the New York Yankees, who also happened to reach the world series for the first time in their existence.