The term PGA Event refers to two major golf tournaments: the TOUR and the US Open. The TOUR is a professional golf tournament organized by the Professional Golfers' Association of America (PGA). It is held annually in the United States and Canada and is one of the four major championships in professional golf. The US Open is an annual golf tournament hosted by the United States Golf Association (USGA). It is one of the four major championships in professional golf and is considered to be the toughest test in golf.