Section 15A(3) in The Paschim Banga Ayurvedic System Of Medicine Act, 1961
(3)If any vacancy occurs in the Ad-hoc Committee by reason of death, resignation or removal of a member, or otherwise, the State Government shall appoint another person to fill up the vacancy. The person so appointed shall hold office for the unexpired period of the term of office of the member whose place he fills:Provided that no act or act or proceedings of the Ad-hoc Committee shall be called in question or become invalid merely by reason of any vacancy or vacancies in the Ad-hoc Committee.