Question: When did the 2011 first round draft take place that Casy Matthews was a part of?

Context paragraphs:
Haitian presidential election, 2015: Presidential elections were held in Haiti on 25 October 2015, alongside local elections and the second round of the legislative elections.  Incumbent President Michel Martelly was constitutionally barred from running.  As no candidate received a majority of the vote in the first round, a runoff was to be held on 27 December 2015.  Voter turnout was reportedly 28.8%.  On 22 December the Conseil Electoral Provisoire announced that the runoff has been postponed indefinitely.  However, on 1 January 2016 President Michel Martelly announced that the runoff would be held on 17 January, but on 7 January the President changed the date to 24 January.  On 20 January, Jude Célestin issued a statement that calls "whatever the person who will participate in this January 24 [runoff], is a traitor to the Nation".  Because of rioting and electoral violence, on 22 January the CEP decided to postpone the second round again, with no specific date given, even after President Michel Martelly confirmed the previous day in a nationwide speech that the election should still take place.  The run-off date was later agreed to take place on 24 April 2016.  However, according to Reuters and several other sources, the runoff is postponed again with an indeterminate date most likely after October 2016.  United Nations Secretary-General has expressed deep concern that the agreed upon date for holding elections in Haiti was not met and that no alternate electoral calendar was announced.

1968 NBA draft: The 1968 NBA draft was the 22nd annual draft of the National Basketball Association (NBA).  The draft was held on April 3, 1968, and May 8 and 10, 1968 before the 1968–69 season.  In this draft, 14 NBA teams took turns selecting amateur U.S. college basketball players.  A player who had finished his four-year college eligibility was eligible for selection.  If a player left college early, he would not be eligible for selection until his college class graduated.  The first two picks in the draft belonged to the teams that finished last in each division, with the order determined by a coin flip.  The San Diego Rockets won the coin flip and were awarded the first overall pick, while the Baltimore Bullets were awarded the second pick.  The remaining first-round picks and the subsequent rounds were assigned to teams in reverse order of their win–loss record in the previous season.  Six teams that had the best records in previous season were not awarded second round draft picks.  Two expansion franchises, the Milwaukee Bucks and the Phoenix Suns, took part in the NBA Draft for the first time and were assigned the seventh and eighth pick in the first round, along with the last two picks of each subsequent round.  The St. Louis Hawks relocated to Atlanta and became the Atlanta Hawks prior to the start of the season.  The draft consisted of 21 rounds comprising 214 players selected.

Casey Matthews: Casey Christopher Matthews (born January 16, 1989) is an American football linebacker who is currently a free agent.  He was drafted by the Philadelphia Eagles in the fourth round of the 2011 NFL Draft.  He played college football at Oregon.  He is the brother of Clay Matthews III.

Clay Matthews Jr.: William Clay Matthews Jr. (born March 15, 1956) is a former American football linebacker who played for the Cleveland Browns and the Atlanta Falcons.  He was the first round draft pick of the Cleveland Browns and played in 278 games over 19 NFL seasons, the 17th most appearances in league history (and most playing linebacker).  Matthews had 1,561 tackles in his career, the third most in NFL history, and is trailed most closely by Junior Seau with 1,522 tackles.

Robin Cole: Robin Cole, a former professional American football player, was born September 11, 1955 in Compton, California.  He was the seventh of ten children born to Obediah and Georgia Mae Cole.  He attended high school at Compton High, graduating in 1973.  He furthered his education at the University of New Mexico where he became an All American and the first person to be a first round draft pick out of the University.  He was drafted by the Pittsburgh Steelers, the 21st pick in the first round of the draft.  At Pittsburgh, he was a part of the Steel Curtain defense, replacing Andy Russell as right outside linebacker.  He played linebacker and defensive end for twelve seasons for the Pittsburgh Steelers.  He played in two Super Bowls - Super Bowl XIII and Super Bowl XIV.  Mr. Cole was in the starting lineup in Super Bowl XIV in 1980 and was elected to the Pro Bowl in 1984.  He was runner up for MVP in Super Bowl XIV.  He played one season, 1988, with the New York Jets.

Aniversario: Never Compromise: Aniversario: Never Compromise was a professional wrestling internet pay-per-view (iPPV) event produced by the Chikara promotion, that took place on June 2, 2013, at the Trocadero Theatre in Philadelphia, Pennsylvania.  The event marked Chikara's fourth iPPV, third to take place at the Trocadero Theatre and the promotion's only event to take place in Philadelphia in 2013.  Much like the previous iPPV, Under the Hood, Aniversario: Never Compromise also aired through Smart Mark Video.  Aniversario: Never Compromise celebrated Chikara's eleventh anniversary and was the first anniversary event to take place on iPPV; in the past, the promotion had celebrated its anniversaries with weekends of two shows.  The event saw all three Chikara championships being defended with one title change, where Pieces of Hate (Jigsaw and The Shard) defeated 3.0 (Scott Parker and Shane Matthews) for the Campeonatos de Parejas.  Another major match during the event saw former Campeones de Parejas, Amasis and Ophidian, end their nineteen-month storyline rivalry in a Sarcophagus match.  The event concluded with a major storyline development, where Chikara's authority figure Wink Vavasseur ended the event and shut down the promotion, while the main event was still going on in the ring, leading to the promotion going inactive for a full year.

Geoff Huston: Geoffrey Geoff Angier Huston (born November 8, 1957) is a retired American professional basketball player.  He was a point guard for the New York Knicks, Dallas Mavericks, Cleveland Cavaliers, Golden State Warriors and Los Angeles Clippers.  Collegiately, he played for the Texas Tech Red Raiders.  The Dallas Mavericks traded Huston, along with a 1983 third round draft choice to the Cavaliers in exchange for Chad Kinch and a 1985 first round draft choice on February 7, 1981.

Ladd Herzeg: Ladd Herzeg was general manager of the Houston Oilers in the 1970s and 1980s, under ownership of Bud Adams.  In three years, from 1982 to 1984, with the Oilers he drafted and/or signed three Pro Football Hall of Famers; Mike Munchak a 1st round draft choice in 1982, Bruce Matthews another 1st round draft choice in 1983 and Warren Moon a 1984 Canadian Football League signing.

1967 NBA draft: The 1967 NBA draft was the 21st annual draft of the National Basketball Association (NBA).  The draft was held on May 3 and 4, 1967 before the 1967–68 season.  In this draft, 12 NBA teams took turns selecting amateur U.S. college basketball players.  A player who had finished his four-year college eligibility was eligible for selection.  If a player left college early, he would not be eligible for selection until his college class graduated.  The first two picks in the draft belonged to the teams that finished last in each division, with the order determined by a coin flip.  The Detroit Pistons won the coin flip and were awarded the first overall pick, while the Baltimore Bullets were awarded the second pick.  The remaining first-round picks and the subsequent rounds were assigned to teams in reverse order of their win–loss record in the previous season.  Five teams that had the best records in previous season were not awarded second round draft picks.  Two expansion franchises, the Seattle SuperSonics and the San Diego Rockets, took part in the NBA Draft for the first time and were assigned the sixth and seventh pick in the first round, along with the last two picks of each subsequent round.  The draft consisted of 20 rounds comprising 162 players selected.

2011 NFL Draft: The 2011 NFL Draft was the 76th installment of the annual NFL Draft, where the franchises of the National Football League select newly eligible football players.  Like the 2010 draft, the 2011 draft was held at Radio City Music Hall in New York City, New York, over three days: this year, the first round took place on Thursday, April 28, 2011; the second and third rounds took place on Friday, April 29; with the final four rounds on Saturday, April 30, 2011.

Supporting paragraphs: Casey Matthews 2011 NFL Draft
Answer: Thursday, April 28, 2011