Indiana Code Title 3. Elections § 3-10-5-1

Sec. 1. Whenever the Congress of the United States proposes an amendment to the Constitution of the United States and proposes that it be ratified by conventions in the several states, the governor shall fix, by proclamation, the date of an election to elect the delegates to the convention in this state.  The election shall be held within sixty (60) days after the date of the proclamation and within four (4) months after the date of the receipt of the proposed amendment by the appropriate official from the Secretary of State of the United States.  If a general election occurs within this period, the special election shall be held at the same time and by the same election officers who conduct the general election.