Question:  What annual event occurs on a property co-founded by an American who was the best-selling recording artist of the 20th century?

<P0-S0> Mariah Carey (born March 27, 1969 or 1970) is an American singer, songwriter, record producer, and actress. <P0-S1>  In 1990, she rose to fame with the release of "Vision of Love" from her eponymous debut album. <P0-S2>  The album produced four chart-topping singles in the US and began what would become a string of commercially successful albums which solidified the singer as Columbia Records' highest selling act. <P0-S3>  Carey and Boyz II Men spent a record sixteen weeks atop the "Billboard" Hot 100 in 1995–1996 with "One Sweet Day," which remains the longest-running number-one song in US chart history. <P0-S4>  Following a contentious divorce from Sony Music head Tommy Mottola, Carey adopted a new image and traversed towards hip hop with the release of "Butterfly" (1997). <P0-S5>  In 1998, she was honored as the world's best-selling recording artist of the 1990s at the World Music Awards and subsequently named the best-selling female artist of the millennium in 2000. <SEP> <P1-S0> The Del Mar Fairgrounds is a 370 acre property that is the site of the annual San Diego County Fair (called the Del Mar Fair from 1984 to 2001). <P1-S1>  Its Del Mar racetrack was built by the Thoroughbred Club in 1937 by founding members Bing Crosby and Pat O'Brien with Paramount Studios as corporate sponsor. <SEP> <P2-S0>  Crosby's trademark warm bass-baritone voice made him the best-selling recording artist of the 20th century, having sold over one billion records, tapes, compact discs and digital downloads around the world. <P2-S1> Harry Lillis "Bing" Crosby Jr. ( ; May 3, 1903 – October 14, 1977) was an American singer and actor. <SEP> <P3-S0> The World Series, the modern championship series of Major League Baseball, began in 1903, and was established as an annual event in 1905. <P3-S1>  Before the formation of the American Association (AA), there were no playoff rounds—all championships went to the team with the best record at the end of the season. <P3-S2>  In the initial season of the National League (NL) in 1876, there was controversy as to which team was the champion: the Chicago White Stockings, who had the best overall record (52–14), or the St. Louis Brown Stockings (45–19), who were the only team to have a winning record against every other franchise in the league. <P3-S3>  The teams agreed to play a five-game "Championship of the West" series, won by St. Louis, 4 games to 1. <P3-S4>  Beginning in 1884, the championship series between the National League and the American Association were promoted and referred to as the "World's Championship Series" (WCS), or "World's Series" for short; however, they are not officially recognized by Major League Baseball as part of World Series history. <P3-S5>  Though early publications, such as Ernest Lanigan's "Baseball Cyclopedia" and Turkin and Thompson's "Encyclopedia of Baseball", listed the 19th-century games on an equal basis with those of the 20th century, "Sporting News" publications about the World Series, which began in the 1920s, ignored the 19th-century games, as did most publications about the Series after 1960. <P3-S6>  Major League Baseball, in general, regards 19th-century events as a prologue to the modern era of baseball, which is defined by the emergence of the two present major leagues.