The Town Board shall appoint at least one person, but not more than two persons, as an alternate member of the Zoning Board of Appeals for a term of five calendar years. The term of the first-appointed alternate member serving at the time of adoption of this provision shall end on December 31, 2020, and the subsequent terms shall end on December 31 of the ensuing five-year periods. The term of any additional alternate member shall be staggered to as to terminate on December 31 of successive years. Appointments to fill vacancies shall be for the remainder of the term of the position to be filled. All provisions of this Zoning Law relating to Zoning Board member training and continuing education, attendance, conflict of interest, compensation, eligibility, vacancy in office, removal, and service on other boards shall also apply to alternate members. Notwithstanding any limitation contained in NYS Town Law § 267 or elsewhere, the chairperson of the Zoning Board of Appeals shall be authorized to designate an alternate member so appointed to participate in any meeting, vote, action, or proceeding of the Board in place of a member who is unable to participate due to a conflict of interest or absence, provided that such alternate shall have been in attendance for any public hearing in relation to the matter at issue or otherwise familiarized himself or herself with the relevant record prior to casting a vote in the determination or disposition of a matter. The designation of the alternate member shall be entered into the minutes of the initial Zoning Board of Appeals meeting at which the substitution is made. At all other times, an alternate member may participate in discussions of the proceedings, but may not vote.