Delegates meet in Philadelphia, Pennsylvania, to convene the Constitutional Convention and write a new Constitution for the United States.
Technically this convention is only supposed to revise and improve the Articles of Confederation, but many of the delegates realize that the Articles are unworkable and will not create a United States that is a viable nation.
Thus their expectation is that they will be starting over fresh. Only a few delegates are present at this first meeting, and it's not until May 25 that a quorum can be established. It is at that point that George Washington is elected president of the convention.
James Madison will keep copious notes of the convention's proceedings, and his own plans for the U.S. Constitution are, for the most part, greeted with approval by most delegates.