What was the first national event to be covered on the radio?

The first national event to be covered on the radio was the inauguration of President Calvin Coolidge on March 4, 1925. This marked a significant moment in broadcasting history, as it allowed listeners across the country to hear the event live for the first time. The broadcast showcased the potential of radio as a medium for delivering news and events to a wide audience, paving the way for future live coverage of important events.