Per Bylaws: Article II D.E.C. Membership / Section 3. Vacancies / Paragraph (b) & (c)
(b) A seat shall be deemed vacant when a member accumulates three (3) unexcused absences in any one (1) calendar year. Members who expect to be absent for good and sufficient reason shall submit or make prior notification to be excused. An absence is excused for reason of illness, business, out-of-town or other reasonable excuse, with prior notification to the chair or an officer.
(c) Members who have more than three (3) excused absences or who use more than three (3) proxies within a calendar year shall be referred to the Membership Committee for investigation and report to the D.E.C. concerning removal or retention.