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.
World Masters (darts) The Winmau World Masters is one of the longest running and most prestigious professional darts tournaments, which began in 1974 - even before the current World Professional Championship. The tournament has been sponsored by darts board manufacturer, Winmau for 40–41 years.