Question: At what location was the NBA draft held in which Al Jefferson was drafted by the Boston Celtics?

Context paragraphs:
1951 NBA All-Star Game: The 1951 NBA All-Star Game was an exhibition basketball game played on March 2, 1951, at Boston Garden in Boston, Massachusetts, home of the Boston Celtics.  The game was the first edition of the National Basketball Association (NBA) All-Star Game and was played during the 1950–51 NBA season.  The idea of holding an All-Star Game was conceived during a meeting between NBA President Maurice Podoloff, NBA publicity director Haskell Cohen and Boston Celtics owner Walter A. Brown.  At that time, the basketball world had just been stunned by the college basketball point-shaving scandal.  In order to regain public attention to the league, Cohen suggested the league to host an exhibition game featuring the league's best players, similar to the Major League Baseball's All-Star Game.  Although most people, including Podoloff, were pessimistic about the idea, Brown remained confident that it would be a success.  He even offered to host the game and to cover all the expenses or potential losses incurred from the game.  The Eastern All-Stars team defeated the Western All-Stars team 111–94.  Boston Celtics' Ed Macauley was named as the first NBA All-Star Game Most Valuable Player Award.  The game became a success, drawing an attendance of 10,094, much higher than that season's average attendance of 3,500.

Los Angeles Lakers all-time roster: The Los Angeles Lakers are an American professional basketball team based in Los Angeles, California.  They play in the Pacific Division of the Western Conference in the National Basketball Association (NBA).  The Lakers' franchise was founded in 1947 in Detroit, Michigan before moving to Minneapolis, Minnesota, where the team got its official title from the state's nickname, "Land of 10,000 Lakes".  The Minneapolis Lakers won five NBA Finals before relocating to Los Angeles in the 1960–61 NBA season, becoming the first West Coast team in league history.  In the 1960s, the Lakers reached the NBA Finals six times, but lost every series to the Boston Celtics, beginning their long and storied rivalry.  In 1972, with future Hall of Famers Wilt Chamberlain, Gail Goodrich, and Jerry West, the Lakers compiled a 33-game winning streak, the longest streak in U.S. professional team sports, and won their sixth title under coach Bill Sharman.  The Lakers' popularity soared in the 1980s when they won five additional championships during a nine-year span with the help of Hall of Famers Magic Johnson, Kareem Abdul-Jabbar, James Worthy and coach Pat Riley, the franchise's all-time leader in both regular season and playoff games coached and wins.  Two of those championships during that span were against their arch-rivals, the Boston Celtics.  With the team of Shaquille O'Neal, Kobe Bryant, Toby Tincher, and Hall of Fame coach Phil Jackson, the Lakers played in four of the first five NBA Finals of the 21st century; winning three consecutively from 2000 to 2002, and losing the fourth in 2004.  The Lakers would then conclude the decade with three straight Finals appearances; losing to the Boston Celtics in 2008 but then prevailing with back-to-back championships against the Orlando Magic in 2009 and the Boston Celtics in 2010.  The 2010 championship marks the 16th NBA championship in Lakers franchise history.

1980 NBA draft: The 1980 NBA draft was the 34th annual draft of the National Basketball Association (NBA).  The draft was held on June 10, 1980, before the 1980–81 season.  In this draft, 23 NBA teams took turns selecting amateur U.S. college basketball players and other eligible players, including international players.  The first two picks in the draft belonged to the teams that finished last in each conference, with the order determined by a coin flip.  The Boston Celtics, who obtained the Detroit Pistons' first-round pick in a trade, won the coin flip and were awarded the first overall pick, while the Utah Jazz were awarded the second pick.  The Celtics then traded the first pick to the Golden State Warriors before the draft.  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.  An expansion franchise, the Dallas Mavericks, took part in the NBA Draft for the first time and were assigned the eleventh pick in each round.  A player who had finished his four-year college eligibility was automatically eligible for selection.  Before the draft, five college underclassmen announced that they would leave college early and would be eligible for selection.  The draft consisted of 10 rounds comprising the selection of 214 players.  This draft has the distinction of being the first NBA Draft to be televised.

2004 NBA draft: The 2004 NBA draft was held on June 24, 2004, at The Theater at Madison Square Garden in New York City, and was broadcast live on ESPN at 7:00 pm (EDT).  In this draft, National Basketball Association teams took turns selecting amateur college basketball players and other first-time eligible players.  The NBA announced that 56 college and high school players and 38 international players had filed as early-entry candidates for the 2004 draft.  On May 26, the NBA draft lottery was conducted for the teams that did not make the NBA Playoffs in the 2003–04 NBA season.  The Orlando Magic, who had a 25 percent chance of obtaining the first selection, won the lottery, while the Los Angeles Clippers and the Chicago Bulls were second and third respectively.  As an expansion team, the Charlotte Bobcats had been assigned the fourth selection in the draft and did not participate in the lottery.  The Minnesota Timberwolves forfeited their first-round pick due to salary cap violations.

2017–18 Boston Celtics season: The 2017–18 Boston Celtics season will be the 72nd season of the franchise in the National Basketball Association (NBA).  They originally acquired the #1 pick of the NBA draft due to a previous trade involving the Brooklyn Nets, only to then trade the #1 pick of the NBA draft to the Philidelphia 76ers in exchange for two different draft picks.  They also acquired Gordon Hayward in free agency on July 7 and Kyrie Irving via trade on August 22, 2017 in exchange for rookie Ante Žižić, Jae Crowder, star point guard Isaiah Thomas, the Brooklyn Nets' completely unprotected first round pick in the 2018 NBA draft, and later adding a 2020 second round pick originally from the Miami Heat eight days later.  The Celtics will play the first game of the regular season on October 17, 2017 against the Cleveland Cavaliers, Irving's former team, and retire the number 34 of former small forward Paul Pierce on February 11, 2018 against the Cavs.

Guerschon Yabusele: Guerschon Yabusele (born December 17, 1995) is a French professional basketball player for the Boston Celtics of the National Basketball Association (NBA).  He was considered one of the best international prospects for the 2016 NBA draft.  Yabusele was drafted with the 16th overall pick in the 2016 NBA draft by the Boston Celtics.

Abdel Nader: Abdel Nader (born September 25, 1993) is an Egyptian-American basketball player for the Boston Celtics of the National Basketball Association (NBA).  He played college basketball for Northern Illinois and Iowa State before being drafted by the Boston Celtics with the 58th overall pick in the 2016 NBA draft.

Kadeem Allen: Kadeem Frank Allen (born January 15, 1993) is an American basketball player for the Boston Celtics of the National Basketball Association (NBA), on a two-way contract with the Celtics' NBA G League affiliate, the Maine Red Claws.  He was selected with the 53rd pick of the 2017 NBA draft by the Boston Celtics.

Al Jefferson: Al Ricardo Jefferson (born January 4, 1985) is an American professional basketball player for the Indiana Pacers of the National Basketball Association (NBA).  He played high school basketball for Prentiss High School in Mississippi before skipping college to enter the 2004 NBA draft, where he was drafted 15th overall by the Boston Celtics.  He has previously played for the Celtics, Minnesota Timberwolves, Utah Jazz and Charlotte Hornets.

1946–47 Boston Celtics season: The 1946–47 Boston Celtics season was the first season of the Boston Celtics in the Basketball Association of America (BAA/NBA).  Walter A. Brown was the man who was responsible for starting the franchise.  On an early June day in 1946, Brown, who operated the Boston Garden arena and was part of the National Hockey League's Boston Bruins, was the driving force behind the Basketball Association of America and the Celtics birth.  After considering several team names, including Whirlwinds, Unicorns and Olympics, Brown opted for Celtics.  He hoped to grab the attention of Boston's large Irish American population.  John Davis "Honey" Russell was hired as the first Celtics coach, and the team soon began its inaugural season, losing its first game 59–53 to the Providence Steamrollers.  Although the Celtics would eventually become the signature franchise of the NBA, the club had a lacklustre first season as they started with 0 wins and 5 losses.  The Celtics won their first game of the season against the Toronto Huskies.

Supporting paragraphs: Al Jefferson 2004 NBA draft
Answer: The Theater at Madison Square Garden