Final answer:
The self-declared National Assembly took the Tennis Court Oath, vowing not to disband until a constitution was established, thus igniting revolutionary change and addressing the plight of Parisian laborers.
Step-by-step explanation:
When the self-declared National Assembly found itself locked out of its meeting hall, instead of dissolving, they moved to a nearby indoor tennis court on June 20, 1789, and took the historic Tennis Court Oath. This pivotal event saw the Assembly members swearing not to disband until they had written a new constitution for France. In an immediate response to the widespread dissatisfaction and the rallying of Parisian laborers, the Assembly declared the old tax system null and void and began addressing the food shortages that impacted the poor, thus setting the stage for further revolutionary acts, including the storming of the Bastille and the establishment of a constitutional monarchy.