Question: When was the band of the extended play To Be One officially announced?

Context paragraphs:
Sam Sparro discography: Sam Sparro, the Australian born pop, dance, house, and soul singer-songwriter, producer, and remix engineer, has released two studio albums. His eponymous debut album, "Sam Sparro", released through both Modus Vivendi and Island Records, has been certified Gold.  His second album, "Return to Paradise" was released with EMI.  He has released two mixtapes. On August 5, 2013 Sparro released the mixtape "Mechanical."  to his SoundCloud account to promote his upcoming extended play, "Quantum Physical, Vol.  1". "Love Made Me Do It" was released via his SoundCloud account on February 13, 2015.  Sparro has released five extended plays. His first extended play "Black + Gold" was released by Modus Vivendi Music in January 2007.  "London Festival '08" was first released on January 1, 2008 with Island Records.  Sparro released his third extended play, "Pink Cloud", as a free download to promote his then upcoming second album before a number of release push-backs.  He released "Quantum Physical, Vol.  1" independently on October 1, 2014.  On October 16, 2015 Sparro released the second volume of "Quantum Physical" with Intuit Records.

Suicide Prevention Hotline: Suicide Prevention Hotline EP is an official extended play release from Alaska in Winter.  It debuted 31 May 2011 through the band's Blogspot account, and a note published on its Facebook page.  According to frontman Brandon Bethancourt, although the extended play is available merely on twenty micro-cassettes through his BigCartel page as an exclusive pre-release, the extended play will formally be released in "CD and mp3 form soon."  The limited-edition micro-cassette format is designed for usage in telephone answering machines lest the "unanswered cries" from the extended play not be heard by listeners.  Additionally, the limited-edition "pre-release" package includes a pill bottle, which contains a personal, but brief, message, written by Bethancourt himself.

Living Things World Tour: The Living Things World Tour was the eighth concert tour by American alternative metal band Linkin Park.  It was launched in support of Linkin Park's fifth studio album "Living Things" (2012).  The tour was officially announced in April 2012 through a teaser released after the release of trailer of the 11th Annual Honda Civic Tour by Linkin Park and Incubus.  Later tour was officially announced during the Honda Civic Tour.  Its first leg under the name "Living Things South American Tour" began on October 5, 2012 in Buenos Aires and ended on October 12, 2012 in Porto Alegre.  Two shows during the whole tour were cancelled.  Both the shows were in Brazil.  The following statement was issued on the official site: "Due to logistical issues, some changes have been made to Linkin Park's upcoming Brazilian tour.

World of Warcraft: Cataclysm: World of Warcraft: Cataclysm is the third expansion set for the massively multiplayer online role-playing game (MMORPG) "World of Warcraft", following "".  It was officially announced at BlizzCon on August 21, 2009, although dataminers and researchers discovered details before it was officially announced by Blizzard.  The expansion was officially released on December 7, 2010.

Pacific Gold: Pacific Gold, (formerly, Wayfarer), is an American Christian music band.  They come from Seattle, Washington.  The band started making music in 2012.  Their membership is Torry Anderson, Brian Hibbard, Dan Koch, John Raines, and David Stuart.  The band released, an extended play, "The River", independently, in 2012, also the same year, another extended play released independently, "The Holly & the Ivy".  They released, a third extended play, "Pacific Gold", in 2013, independently.  Their first studio album, "Sing My Welcome Home", was released by BC Music, standing for Bad Christian Music, in 2015.

Jeffree Star discography: The discography of American singer-songwriter Jeffree Star consists of one studio album, three extended plays, five singles and four music videos.  After self-releasing an extended play "Plastic Surgery Slumber Party" in 2007, Star founded his own label Popsicle Records.  He released his second extended play, "Cupcakes Taste Like Violence", in December 2008.  The extended play produced one commercial single, "Lollipop Luxury".  In September 2009, Star released his debut studio album, "Beauty Killer".  The album produced one commercial single, "Prisoner" and two music videos for "Get Away with Murder" and "Beauty Killer".  On October 2, 2012, Star released a four-track single called "Mr. Diva" to tide fans over and play new music on tour.  "Mr. Diva" was also released as a limited edition vinyl record with "Legs Up" being the B-side track; it was a red heart shape with 500 copies printed.  Star released his single "Love to My Cobain" on June 25, 2013 with the music video being released August 15.

Play (Swedish group): Play was a Swedish pop girl group consisting of, in total, seven young women.  Faye Hamlin, Anna Sundstrand, Anaïs Lameche, and Rosie Munter formed Play's original line-up from the band's formation from 2001 until late 2003.  After founding member Faye left the group, fifth member Janet Leon joined Play to fill Hamlin's position as lead singer.  In 2005, the group officially announced an "indefinite break" and split up.  At that time, Play had sold almost one million albums.  Four years later, in 2009, the group reformed with a new line-up of three members consisting of Anaïs, Faye, and the sixth and oldest member of Play, Sanne Karlsson.  In February 2011, an official statement was made that Faye had once again left the group in 2010 and would be replaced by Emelie Norenberg.  It was announced in May 2011 that the band had separated for the second time.

Produce 101 Season 2: Produce 101 Season 2 () is a 2017 boy group survival reality show on Mnet.  It is a large-scale project in which the public (called 'national producers') "produces" a boy band by choosing 11 members among 101 trainees from 54 entertainment companies.  The public also chooses the group's concept, debut song, and group name.  On June 16, 2017, the season finale was broadcast live, announcing the final 11 members who would debut, as well as the official group name Wanna One.

Get Sleazy Tour: The Get Sleazy Tour (stylized as Get $leazy Tour) was the first concert tour by American recording artist Kesha in support of both her first album, "Animal", and first extended play, "Cannibal".  Officially announced on November 8, 2010, the tour visited the Americas, Australia and Europe.  It was scheduled to visit Asia but due to the 2011 Tōhoku earthquake and tsunami the tour was postponed indefinitely.  Described by Kesha as "a ridiculously fun dance party", the concerts were presented as underground rave ups drawing inspiration from her earlier life when she was growing up in Tennessee where she would attend parties.  The tour kicked off on February 15, 2011 in Portland, Oregon and ended September 29, 2011, in Rio de Janeiro.

1X1=1 (To Be One): 1X1=1 (To Be One) (also known as 1×1=1 or To Be One) is the debut extended play by South Korean boy group Wanna One, a project group created through the 2017 Mnet survival show, "Produce 101 Season 2", composed of eleven trainees from different entertainment companies that will promote for 18 months under YMC Entertainment.  The album was released digitally and physically on August 7, 2017 by YMC Entertainment, Stone Music Entertainment and CJ E&M Music.  A Japanese version of the album was released on September 27, 2017 through Pony Canyon.

Supporting paragraphs: 1X1=1 (To Be One) Produce 101 Season 2
Answer: June 16, 2017