What significant event occurred on June 20 during the early days of the French Revolution?

The significant event that occurred on June 20 during the early days of the French Revolution was the Tennis Court Oath. This event took place when members of the Third Estate, who felt marginalized by the other estates, found themselves locked out of a meeting of the Estates-General. They gathered in a nearby indoor tennis court, where they vowed not to disband until they had created a new constitution for France. This moment is crucial because it marked a pivotal shift in the power dynamics of France, as the Third Estate asserted its voice and authority in the face of the traditional power held by the monarchy and the other estates. The Tennis Court Oath symbolizes the transition from absolute monarchy to a more representative form of governance, laying the groundwork for the later phases of the revolution.