The council of 500 met over two months.
The Boule (Council of 500) met in the Bouleterion in Ancient Athens.
When ever it is needed, it meets.
Quaterly
once a month
The Council of 500 would vote on who to put in the council and who not to put on the council.
Councils usually meet in council offices - in the council chamber.
once every 500 years
What percent were eligible to become members of the smaller Council of 500
Sligo County Council meet in the Chamber Hall in County Hall, Riverside, Sligo, Co. Sligo.
Elrond takes into consideration all the resolution of the council after they meet.
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Somathing simple