Suggest:
The Open General Meeting will be quorate if, there are present: a) At least 2 of the current President, Secretary and Treasurer. and b) At least 1 of the Local Organisers. and c) A minimum of 10 other people attending the Colloquium.(Re-wording: P.E.D. 5/2/97)
Possible changes:
(1) seems a little bit extreme. Some combination of (2) and (3) might be adopted if this is felt to be important.
Simplest solutions would be to insert the word `up to' in 4.1. or remove the numerical specification. (Modifications: P.E.D. 6-7/2/97)