Rhode Island did not send delegates to the 1787 Constitutional Convention.
The convention met in Philadelphia to revise the Articles of Confederation, but it ultimately drafted an entirely new Constitution. Delegates from 12 states attended and 39 eventually signed the document on September 17, 1787.
Rhode Island opposed the convention and declined to participate. Its leaders feared that a stronger national government could threaten state authority, commerce, and individual liberties. The state therefore had no representatives at the convention and no delegates among the Constitution’s signers.
Rhode Island later became the 13th state to ratify the Constitution, doing so on May 29, 1790. That later ratification is why the state joined the Union under the new constitutional system despite having refused to attend the convention.