Question: What is the release date of the fourth mixtape by American rapper Joyner Lucas?

Context paragraphs:
Mixtape Messiah 4: Mixtape Messiah 4 is the fourth mixtape by American rapper Chamillionaire in his "Mixtape Messiah" series.  It is a two-disc set that was released on August 27, 2008.

Happy Birthday (mixtape): Happy Birthday is the fourth mixtape released by British rapper Tinie Tempah.  The mixtape was released for free download on December 16, 2011 on Disturbing London Records - featuring production from 3Mindz, S-X, Wizzy Wow and Stargate.  The mixtape title is "Happy Birthday" because the mixtape came into production around Tempah's 23rd birthday (November 7).  Tracks "Like It or Love It", "Lucky Cunt" and "Till I'm Gone (Remix)" were leaked prior to the mixtape release to create buzz, with "Like It or Love It" receiving minor radio airplay.  "Happy Birthday" features British rappers Chipmunk, Giggs, Wretch 32, G-Frsh, Tinchy Stryder and Krept and Konan, including a variety of American rappers; Soulja Boy, J. Cole and Big Sean, along with Wiz Khalifa, Pusha T and Jim Jones on the "Till I'm Gone" remix (originally released on August 29, 2011).  British vocalist J. Warner also makes a guest appearance.

K.I.D.S. (album): K.I.D.S. ("Kickin' Incredibly Dope Shit") is the fourth mixtape by the American rapper Mac Miller.  It was released by Rostrum Records on August 13, 2010.  Since its release, it has been viewed over 2,200,000 times, downloaded over 800,000 times, and streamed over 550,000 times from the official host of the mixtape, DatPiff.com.  The title of "K.I.D.S." is a play on words, as it was an acronym that stands for "Kickin' Incredibly Dope Shit", while at the same time a reference to the 1995 film "Kids", which is quoted throughout the mixtape.

Joyner Lucas: Joyner Lucas (born August 17, 1988), is an American rapper from Worcester, Massachusetts currently signed to Atlantic Records.  He garnered widespread exposure and critical praise after the release of his single "Ross Capicchioni" in 2015.  In 2017, he released his fourth mixtape (and first on a major label), "508-507-2209".

The Perfect Luv Tape: The Perfect Luv Tape is the fourth mixtape by American rapper Lil Uzi Vert.  It was released on July 31, 2016 by Generation Now and Atlantic Records.  The album features productions from Cubeatz, Don Cannon, DP Beats, Ike Beatz, Lyle LeDuff, Maaly Raw, Nard & B, Metro Boomin, XL Eagle and Zaytoven.  The album is considered a spiritual successor to "Lil Uzi Vert vs. the World" as it retains subtle references to the mixtape, as well as the graphic novel series Scott Pilgrim, on its cover art.  The cover art was created by Eryck Sakutaro.  The first letters of the titles of all ten tracks on the mixtape, when arranged in order, spell the word "Doomsayers".  The song "Do What I Want" has been featured in the soundtrack for the video game "NBA 2K18".

The Other Half of Letting Go: The Other Half of Letting Go... is the fourth official mixtape from Milwaukee, Wisconsin rapper Gerald Walker.  The mixtape was released on September 20, 2011, through One Step at a Time Music.  The mixtape is named after American painter Esao Andrews' piece also titled "The Other Half of Letting Go."  The mixtape's lead single, "The Missing Piece" is produced by Chemist.  The second single, "Shackles" was produced by J.LBS.  The mixtape was originally scheduled to be released by Grand Hustle Records, however Walker announced his intention to self-publish: "No Grand Hustle, we're gonna do this ourselves."  with a September 20 release date.

Trap God: Trap God is a mixtape by American rapper Gucci Mane, released on October 17, 2012.  The mixtape was announced on July 31, 2012, with no release date notified.  However, on August 8, Gucci announced that October 17, 2012, would be the date of the release.  The mixtape features major guest appearances from Rick Ross, Waka Flocka Flame, Meek Mill, Future, T-Pain, Kevin McCall, Trae Tha Truth, Kirko Bangz, and Birdman, as well as up and coming rapper Young Scooter who is featured on 6 of the tracks.

508-507-2209: 508-507-2209 is a mixtape by American rapper Joyner Lucas.  It was released on June 16, 2017, by Atlantic Records.

Merry Christmas Lil' Mama: Merry Christmas Lil' Mama is a collaborative Christmas mixtape by R&B singer Jeremih and hip hop recording artist Chance the Rapper.  It is the fourth mixtape by Jeremih, and the fourth mixtape by Chance the Rapper.  The mixtape was self-released via SoundCloud on December 22, 2016, and features collaborations with Hannibal Buress, King Louie, Noname, Lud Foe, and Teddy Jackson.  The mixtape is dedicated to the city of Chicago.

G Herbo: Herbert Randall Wright (born October 8, 1995), better known by his stage name G Herbo (formerly known as Lil Herb) is an American rapper and songwriter from Chicago, Illinois.  Herb released his debut mixtape, "Welcome to Fazoland", to critical acclaim in February 2014, followed by a second mixtape "Pistol P Project" in December 2014.  In September 2015, Herb signed a deal with Cinematic Music Group & Sony Music.  His third mixtape, "Ballin Like I'm Kobe", was released on September 29, 2015.  Herb's fourth mixtape, "Strictly 4 My Fans", was released on November 24, 2016.  His debut studio album "Humble Beast" was officially released on September 22, 2017.

Supporting paragraphs: Joyner Lucas 508-507-2209
Answer: June 16, 2017