The regular monthly meetings of the City Council shall be held at the Harrisburg Liberty Elementary Community Room or other designated place on the first and third Monday of each month at 6:00 p.m. except when Monday is a legal holiday, and in that case the meeting shall be held on another specified date.  Meetings may be held on other specific dates or places as set by the Mayor with the majority vote of the City Council.

Executive Sessions are sometimes needed, here is a guide as to when

Conducting the Public's Business in Public Guide