Article V: The Congress, whenever two thirds of both Houses shall deem it necessary, shall propose Amendments to this Constitution, or, on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as part of this Constitution, when ratified by the Legislatures of three fourths of the several States, or by Conventions in three fourths thereof, as the one or the other Mode of Ratification may be proposed by the Congress; Provided that no Amendment which may be made prior to the Year One thousand eight hundred and eight shall in any Manner affect the first and fourth Clauses in the Ninth Section of the first Article; and that no State, without its Consent, shall be deprived of its equal Suffrage in the Senate.
And tell the SCOTUS how they must interpret the Constitution, and maybe fix a few other things - it has never been done ... but.
A constitutional convention would scare the living daylights out of me. For one thing, we'd end up with a document the length of the EU constitution, and instead of a Bill of Rights, we'd end up with a Bill of Wrongs.
Trust me, even our brainless wonders could figure that one out.