15 Pa. C.S. § 7713
After the organization of a corporation, the incorporators shall hold an organizational meeting at a time and place fixed by the board of directors and shall adopt a set of bylaws. Not less than ten days' written notice of the meeting shall be given to each incorporator. Thereafter, there shall be at least one meeting of members each year. Annual and special membership meetings shall be governed by the corporation's bylaws. The bylaws shall provide for the giving of notice to members of each meeting of the corporation. For all meetings of the corporation, notice as provided in this section need not be given to members or other stockholders to whom the notice may be required by this chapter if a written waiver of the notice is executed before or after the meeting by each individual and is filed with the records of the meeting.
15 Pa.C.S. § 7713