Legal provisions for optional referendums at national level

Palau
Article XIV Section 1
Section 1. Anamendment to this Constitution may be proposed by a Constitutional Convention,popular initiative, or by the Olbiil Era Kelulau, as provided herein:
(a) at leastonce every fifteen (15) years, the Olbiil Era Kelulau may submit to the votersthe question: “Shall there be a Convention to revise or amend the Constitution?”.If a majority
of the votescast upon the question is in the affirmative, a Constitution Convention shallbe convened within six (6) months thereafter, in a manner prescribed by law;