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.
2017 World Series of Poker
The Main Event was streamed live on ESPN2 and Poker Central beginning on July 8 and ran throughout the tournament. For the first time since 2007, the Main Event concluded in July; for the previous nine years, once the final table was set the Main Event was stopped with the nine remaining players returning to the Rio in November to battle it out for the bracelet.Source: 
The $10,000 No Limit Hold'em Main Event began on July 8 with the first of three starting flights. The final table was reached on July 17. In a change from the November Nine, the finalists returned on July 20 with the winner being determined on July 22.