Indiana Code Title 3. Elections § 3-13-1-9

(1) be in writing on a form prescribed by the election division;

(2) state the name of the chairman of the meeting;

(3) state the purpose of the meeting;

(4) state the date, time, and place of the meeting;

(5) be sent by first class mail, at least ten (10) days before the meeting, to all persons eligible to participate in the meeting;  and

(6) be filed not later than noon ten (10) days before the meeting with the official who is required to receive a certificate of candidate selection following the caucus under section 15 of this chapter.