George washington and benjamin franklin
Thomas Jefferson, away in Paris; Patrick Henry, who "smelt a rat".
It seems there might be a typo or missing context in your question regarding which "convection" you're referring to. If you meant "convention," please specify which convention (e.g., a political convention, a cultural event) you are asking about. However, if you're asking about the Constitutional Convention of 1787, three famous Americans who attended were George Washington, Benjamin Franklin, and James Madison.
Benjamin Franklin was the diplomat, writer, inventor, and scientist who attended the Constitutional Convention.
Constitutional Convention
Benjamin Franklin is the famous polymath who attended the Constitutional Convention. Franklin served many roles during his life including that of a diplomat and an inventor.
Benjamin Franklin is the famous polymath who attended the Constitutional Convention. Franklin served many roles during his life including that of a diplomat and an inventor.
Benjamin Franklin
Charles Pinckney
we the people
yes it was Benjamin Franklin
Christian Statesman Patrick Henry