Section 47(7) in West Bengal Societies Registration Rules, 1963
(7)The casual vacancy in the office of an elected director shall be filled up by co-option of a director by the remaining directors within six weeks from the date of vacancy. The director co-opted shall retire at the next Annual General Meeting and the vacancy shall be filled up by election of a director for the remainder of the term, if any, of the director in whose place the vacancy originally occurred.
