What tournament is annually held in Las Vegas since the 1970s?
World Series of Poker The World Series of Poker (WSOP) is a series of poker tournaments held annually in Las Vegas and, since 2005, sponsored by Caesars Entertainment Corporation (known as Harrah's Entertainment until 2010). It dates its origins to 1970, when Benny Binion invited seven of the best-known poker players to the Horseshoe Casino for a single tournament, with a set start and stop time, and a winner determined by a secret ballot of the seven players.
Virginia Slims of Dallas The Virginia Slims of Dallas is a defunct WTA Tour affiliated women's tennis tournament played from 1972 to 1989. From 1979 through 1982 the event was known as the Avon Championships of Dallas. It was held in Dallas, Texas in the United States and played on indoor carpet courts.