With respect, I suggest you read your standing orders. If an extraordinary meeting is being convened in accordance with standing orders i.e. by the Chair, when requested to do so or by the specified number of members, it is still a meeting of the council so although the notice of meeting is signed according to the manner in which it is convened I would suggest it is still your responsibility to prepare the agenda in accordance with the business to be discussed (including the wording of the resolution which is to be proposed) and, like all meetings of the council, it does require three clear days notice (unless the business to be transacted requires more - again check standing orders) and someone has to take minutes whether that be a locum (if the clerk is not available), clerk or even a councillor. Extraordinary meetings are simply meetings of the council which are not part of the normal agreed meeting schedule and/or normal agreed business of the council.