(a) For the purposes of this section, “primary day” means the day that a primary for state, district and municipal offices is being held in accordance with § 9-423, and “election day” means the day of each regular election. (1) The registrars of voters of each town shall hold sessions to examine the qualifications of electors and admit those found qualified on the dates and at the times set forth in this section. Such sessions shall be held on the following days during the hours indicated, except as provided in subdivision (2) of this subsection:

The session of the registrars of voters on the seventh day before election day shall be the last session for admission of electors prior to an election, as defined in subsection (y) of § 9-1. (2) No town having a population of less than twenty-five thousand persons shall be required to hold sessions for admission of electors on the fourteenth day before primary day.

(b) Notwithstanding the provisions of subsection (a) of this section, the registrars of voters shall hold a limited session on the last week day before each regular election from nine o’clock a.m. to five o’clock p.m. for the purpose of admitting only those persons whose qualifications as to age, citizenship or residence in the municipality were attained after the last session for admission of electors prior to an election. The registrars shall enter the names of those electors admitted at such limited session on the proper list, with their residences by street and numbers.

(c) In addition to the sessions held pursuant to subsections (a) and (b) of this section, the registrars of voters in each town shall:

(1) Hold one session each year, between the first of January and the last day of the school year, at each public high school in such town, for the admission of persons who are eligible for admission under subsection (a) or (b) of § 9-12, provided, in the case of a public high school in a regional school district, such session shall be held on a rotating basis by the registrars of voters for each town which is a member of the regional school district. The registrars of voters need not give notice of this session by publication in a newspaper; and

(2) Distribute each year, on the fourth Tuesday of September, at each public high school in such town, information regarding eligibility for admission under subsection (a) or (b) of § 9-12 and procedures for applying for such admission. The registrars of voters and the principal of any such public high school shall determine the best means of distributing such information at such public high school.