Wyo. Stat. § 41-10-111
The board shall meet regularly at least once a month at a time and in a place to be designated by the board. Special meetings called by the chairman or any two (2) other directors may be held as often as the needs of the district require, on personal notice to each member of the board or by mail with postage prepaid, at least three (3) days prior to the meeting and addressed at the last known residence of the member as indicated by the records of the district. Three (3) members of the board constitute a quorum at any meeting. A majority of those present is required to perform any duty authorized by this act except if the bylaws require a larger number. Any vacancy on the board shall be filled until the next subsequent director election as provided in the Special District Elections Act of 1994.
W.S. 41-10-111