Yes, The Open Championship is classed as a PGA Tour event. And yes, it is one of the 4 mens majors.
1995
Tallahassee Open - Nationwide Tour event - was created in 1995.
Tallahassee Open - Nationwide Tour event - ended in 1996.
Fort Wayne Open - PGA Tour event - was created in 1950.
Fort Wayne Open - PGA Tour event - ended in 1956.
Tour de France would be a major cycling event
Dew Tour
Tour De france
At club level, the head greens keeper. In a tour event, the competition committee. In the US Open, the USGA. In The Open, the R&A.
Santos Tour Down Under is held in South Australia's capital, Adelaide. It is a major cycling event. This year, the Santos Tour Down Under runs from 19-26 January.
Gordon Sherry played in the 1996 Greater Vancouver Open. He won $4,100, and was included in the 1996 PGA Tour money list.
Florida Classic - Nationwide Tour event - was created in 1999.