Date changes: The Houston Open was moved back six months, from April to October. The Greenbrier Classic was moved back two months, from July to September. Due to the scheduling changes, neither tournament had been on the 2018–19 schedule. The 3M Open moved back three weeks, from early July to late July. The Sanderson Farms Championship moved up five weeks, from late October to mid September. The Shriners Hospitals for Children Open moved up four weeks, from early November to early October. The Rocket Mortgage Classic moved up four weeks, from late June to late May. And the tandem of the WGC-FedEx St. Jude Invitational and Barracuda Championship moved up three weeks, from late July to early July to accommodate the 2020 Summer Olympics.
Most members of the tour play between 20 and 30 tournaments in the season. The geography of the tour is determined by the weather. It starts in Hawaii in January and spends most of its first two months in California and Arizona during what is known as the "West Coast Swing" and then moves to the American Southeast for the "Southern Swing." Each swing culminates in a significant tour event. In April, tour events begin to drift north. The summer months are spent mainly in the Northeast and the Midwest, and in the fall (autumn) the tour heads south again.[citation needed]

Invitational: These events are similar to the regular ones, but have a slightly smaller field and do not follow the normal PGA Tour exemption categories. Invitational tournaments include the Charles Schwab Challenge, the Arnold Palmer Invitational, the RBC Heritage, the Memorial Tournament. The tournaments usually have an association with a golf legend, or in the case of the RBC Heritage, a famous course. The table below illustrates some of the notable features of the exemption categories for these events:[65]
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There are also a number of events which are recognized by the PGA Tour, but which do not count towards the official money list. Most of these take place in the off season (November and December). This slate of unofficial, often made-for-TV events (which have included the PGA Grand Slam of Golf, the Wendy's 3-Tour Challenge, the Franklin Templeton Shootout, the Skins Game, etc.) is referred to as the "Challenge Season" or more commonly as the "Silly Season."
The tour began 91 years ago in 1929 and at various times the tournament players had attempted to operate independently from the club professionals.[1][5] With an increase of revenue in the late 1960s due to expanded television coverage, a dispute arose between the touring professionals and the PGA of America on how to distribute the windfall. The tour players wanted larger purses, where the PGA desired the money to go to the general fund to help grow the game at the local level.[6][7] Following the final major in July 1968 at the PGA Championship, several leading tour pros voiced their dissatisfaction with the venue and the abundance of club pros in the field.[8] The increased friction resulted in a new entity in August, what would eventually become the PGA Tour.[9][10][11][12] Tournament players formed their own organization, American Professional Golfers, Inc. (APG), independent of the PGA of America.[13][14][15] Its headquarters were in New York City.[10] 
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