Shays's Rebellion was a historical event that actually occurred after the Revolutionary War. It happened in Massachusetts between 1786 and 1787. It was basically carried out by farmers that had fought in the Revolutionary War that were unhappy with the current economic situation in the state. They had received next to nothing for fighting in the war and were now facing extremely high taxes that were, for them, impossible to pay.
Originally, the rebellion attempted to use peaceful means to have their voices heard. They protested in or around courthouses, often causing the courts to close. Things slowly started to build in intensity until a sect of the rebellion led by Daniel Shays attempted to procure weapons at an armory. They were shut down by the military, thus ending the rebellion.
The influence and impact of Shays's Rebellion is often debated, but many agree that it was part of the reason George Washington got more involved in politics, as we was involved in stifling the rebellion. It is also commonly said that Shays's Rebellion was one of the reasons a debate about the Articles of Confederation came into national prominence. This debate would eventually lead to the Constitution's creation. It's hard to pin such a thing on one rebellion, though. It could more easily be argued that it created an argument about rights in our country and the power of states versus federal power. It was a big conversation starter, in essence, and scholars vary in their interpretations of how important these conversations were.