ORS § 221.908
The council shall meet the second Tuesday in January succeeding each general municipal election and take the oath of office. The council shall hold regular meetings at least once in each month at such times as the council shall fix by ordinance. Special meetings may be called at any time by the mayor or by three councillors, by written notice delivered to each member then present within the city at least three hours before the time specified for the proposed meeting, which notice shall specify the object and purpose of such special meeting. No other business shall be transacted at any special meeting than that named in said notice and appurtenant thereto. All meetings of the council shall be public and held within the corporate limits of the city at such place as may be designated by ordinance.
ORS 221.908