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.
2015 USA Sevens The 2015 USA Sevens (also sometimes referred to as the 2015 Las Vegas Sevens) is the twelfth edition of the USA Sevens tournament, and the fifth tournament of the 2014–15 Sevens World Series. The tournament is scheduled for February 13–15, 2015 at Sam Boyd Stadium in Las Vegas, Nevada.