Conn. Gen. Stat. § 9-369c

(b) At any such referendum, any person who would be eligible to vote on the question or proposal if he appeared in person and is unable to appear in person for one or more of the reasons set forth in section 9-135 , may cast his vote by absentee ballot, in accordance with the requirements of this section.

(c) Upon receipt of the written form of the question or proposal to be voted on at any such referendum, the municipal clerk shall immediately prepare and print absentee ballots for the referendum. The phrasing of the question or proposal on the absentee ballots shall be identical to the phrasing on the ballot to be used for voting in person at the referendum. Prior to printing the ballots, the registrars of voters of the municipality may provide comments concerning the content and form of such ballots to the clerk.

(d) Upon notification by the municipal clerk that such a referendum will be held, the Secretary of the State shall furnish to such clerk the forms and materials described in section 9-139a in the amount requested by the clerk.

(e) Any person who is eligible to vote by absentee ballot as provided in this section may apply in person or by mail to the municipal clerk for an absentee ballot. Application shall be made on a form furnished by the Secretary of the State, as provided in subsection (d) of this section. Upon receipt of an application or upon the nineteenth day before the date of the referendum, whichever is later, the municipal clerk shall give to the applicant or mail, as the case may be, the absentee ballot and the envelopes furnished by the Secretary of the State. No absentee ballot shall be issued after the opening of the polls at the referendum, except as provided in section 9-150c .

(f) The procedures for issuing, returning, casting and counting absentee ballots, declaring the count and packaging the ballots at elections, shall apply, as nearly as may be, to absentee ballots at referenda.