A meeting of the association must be held at least once each year. Special meetings of the association may be called by the president, a majority of the board of directors or by unit owners having twenty percent (20%), or any lower percentage specified in the bylaws, of the votes in the association. Not less than ten (10) nor more than sixty (60) days in advance of any meeting, the secretary or other officer specified in the bylaws shall cause notice to be hand-delivered, sent prepaid by United States mail, by facsimile, electronically, or by other means expressly authorized by the declaration, to the address of each unit or to any other physical or electronic address designated in writing or by electronic means by the unit owner. The notice of any meeting must state the time, place, and method of attendance of or at the meeting and the items on the agenda, including the general nature of any proposed amendment to the declaration or bylaws, any budget changes, and any proposal to remove a director or officer. Notice may be waived in writing signed by all unit owners.