70.3. Further to the provisions of the third paragraph of section 70, the second paragraph of section 70.1 and the second paragraph of section 70.2, the Council may, by the by-law adopted under section 70, prescribe the conditions under which the failure of a member of the Council, the executive committee or a select or special committee to attend a meeting or to fulfill his obligation to vote at a meeting entails a reduction in his remuneration or indemnity, and prescribe the rules for computing the reduction.