Princiapl Officers Resign after being voted in at meeting - what to do?

This is quite a likely scenario for the AGM of the association of which I’m Hon Sec. The AGM takes place in two weeks, and I want to be prepared for the worst. An unpopular (in some quarters) member is standing for Chairman against two other candidates, and it’s likely that he will be voted in.

If he is voted in, the rumour mill suggests that two officers, at least, may resign from the posts that they will be confirmed in, as they are running unopposed.

What is the usual practice in such circumstances? A fresh period of nominations, followed by a postal ballot? Ditto plus Special General Meeting?

Thoughts please, especially based on experience of such happenings, or preparation theretofore.

I don’t know, but if it’s something that tenuous, I think that I’d resign as Hon Sec.
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“Usual practices” don’t matter. You should apply the rules, that, it is to be hoped, are mentionned in your association’s statutes, regarding the election and/or replacement of officers in case of death or resignation.
That might be a pain in the ass, if it requires a new special general assembly or such things, but given that apparently there are some internal issues in your association, you should strictly follow the rules, in order to avoid the situation turning really ugly for everybody and in particular for you and before being accused of having partisan, ulterior and nefarious motives, regardless of what you do, if you’re unfortunately in charge of handling the issue.

My comments assume that such internal issues aren’t regulated by law in Hong-Kong, of course.

clairobscur nailed it. It depends on what the governing documents say, first, and then on what the governing law says (i.e., if something in the governing documents is illegal, then it can’t be enforced).

I’m also going to go out on a limb and say that handsomeharry nailed it too. I’d also resign. (Perhaps flashing your new “whatever” sign to the association as you depart?)