question: What was held at the United Center in Chicago, Illinois on June 23-24, 2017 and resulted in Sebastian Aho playing under contract as a prospect of the New York Islanders?
answer: 2017 NHL Entry Draft
context: Title: List of New York Islanders players
  Passage: The New York Islanders are a professional ice hockey team based in Brooklyn, New York, United States.  They are members of the Metropolitan Division of the National Hockey League's (NHL) Eastern Conference.  The Islanders franchise has been a part of the NHL since their inception in 1972, formerly playing their home games at Nassau Veterans Memorial Coliseum.  The Islanders now play at the Barclays Center.  Nearly 500 players have played for the team for at least one regular season or playoff game, and nearly 20 have had multiple stints over the years.
  Title: 2017 NHL Entry Draft
  Passage: The 2017 NHL Entry Draft was the 55th NHL Entry Draft.  The draft was held from June 23–24, 2017, at the United Center in Chicago, Illinois.  The first three selections were Nico Hischier, Nolan Patrick and Miro Heiskanen.
  Title: Sebastian Aho (ice hockey, born 1996)
  Passage: Sebastian Aho (born 17 February 1996) is a Swedish professional ice hockey defenceman who is currently playing under contract as a prospect of the New York Islanders in the National Hockey League (NHL).  Aho was drafted by the Islanders, 139th overall, in the 2017 NHL Entry Draft.
  Title: Joel Rechlicz
  Passage: Joel Rechlicz (born June 14, 1987) is an American professional ice hockey player currently an unrestricted free agent who most recently played under contract with the Bakersfield Condors of the American Hockey League (AHL).  Rechlicz is well known for playing the enforcer role and is billed as a tough as nails type of player.  By signing a three-year entry level contract with the New York Islanders in May 2008, Rechlicz became the first player from the reestablished but now defunct International Hockey League to play a game in the National Hockey League.  Along with the Islanders, he has also played with the Washington Capitals.
citations: 2017 NHL Entry Draft Sebastian Aho (ice hockey, born 1996)