Every elective office shall become vacant on the happening of any of the following events before the expiration of the term of such office: the death of the incumbent, his or her resignation, his or her removal from office, his or her recall by the electorate, his or her ceasing to be an inhabitant of the City, his or her absence continuously from the City for more than sixty (60) days without the permission of the Council, his or her conviction of any offense in violation of his or her oath of office or his or her refusal or neglect to take his or her oath of office or to give or render any official bond.