Question: What is the date of the first game played by the American professional basketball team based in Massachusetts?

full_context: Document 1: Boston Celtics: The Boston Celtics are an American professional basketball team based in Boston, Massachusetts. The Celtics compete in the National Basketball Association (NBA) as a member of the league's Eastern Conference Atlantic Division. Founded in 1946 and one of eight NBA teams (out of 23 total teams) to survive the league's first decade, the team is owned by Boston Basketball Partners LLC. The Celtics play their home games at the TD Garden, which they share with the National Hockey League (NHL)'s Boston Bruins. The franchise's 17 championships are the most of any NBA team, and account for 24.3 percent of all NBA championships since the league's founding in 1946. As a percentage of championships won, the Celtics are the most successful franchise to date in the major four traditional North American professional sports leagues.
Document 2: List of Chicago Bulls seasons: The Chicago Bulls are a National Basketball Association (NBA) team based in Chicago, Illinois. Dick Klein founded the Bulls in 1966 after a number of other professional basketball teams in Chicago had failed. In their 50 seasons, the Bulls have achieved a winning record 25 times, and have appeared in the NBA playoffs 34 times. They received international recognition in the 1990s when All-Star shooting guard Michael Jordan led them to their six league championships. The only NBA franchises that have won more championships than the Bulls are the Boston Celtics (17 championships) and Los Angeles Lakers (16).
Document 3: 2017–18 NBA season: The 2017–18 NBA season will be the 72nd season of the National Basketball Association (NBA). The regular season will begin on October 17, 2017, earlier than previous seasons to reduce the number of "back-to-back" games teams are scheduled to play, with the 2017 runners-up Cleveland Cavaliers hosting a game against the Boston Celtics at Quicken Loans Arena in Cleveland, Ohio. Christmas games will be played on December 25. The 2018 NBA All-Star Game will be played on February 18, 2018, at the Staples Center in Los Angeles, California. The regular season will end on April 11, 2018 and the playoffs will begin on April 14, 2018.
Document 4: 2014–15 NBA season: The 2014–15 NBA season was the 69th season of the National Basketball Association (NBA). The NBA draft took place on June 26, 2014, at Barclays Center in Brooklyn, where Andrew Wiggins was selected first overall. The regular season began on Tuesday, October 28, 2014, when the defending NBA champions San Antonio Spurs hosted the first game against the Dallas Mavericks. Christmas games were played on Thursday, December 25, 2014. The 2015 NBA All-Star Game was played on Sunday, February 15, 2015, at Madison Square Garden in New York City, with the West defeating the East 163-158. Oklahoma City's Russell Westbrook won the NBA All-Star Game Most Valuable Player Award. The regular season ended on Wednesday April 15, 2015 and the playoffs began on Saturday, April 18, 2015 and ended with the 2015 NBA Finals on June 16, 2015, after the Golden State Warriors defeated the Cleveland Cavaliers in six games to win their fourth NBA title.
Document 5: 2017 NBA All-Star Game: The 2017 NBA All-Star Game was an exhibition basketball game that was played on February 19, 2017 in New Orleans, Louisiana at the Smoothie King Center. It was the 66th edition of the event. The West won the game 192-182. The MVP of the game was Anthony Davis, who scored 52 points, the most ever scored by a player in an All-Star Game. It was initially planned to be held at Spectrum Center in Charlotte, home of the Charlotte Hornets. If the game had remained in Charlotte, it would have been the second time that Charlotte hosted the All-Star Game. The city previously hosted in 1991 at the now-demolished Charlotte Coliseum.
Document 6: 2017–18 Cleveland Cavaliers season: The 2017–18 Cleveland Cavaliers season will be the 48th season of the franchise in the National Basketball Association (NBA). The Cavaliers will enter the season as the 3-time defending Eastern Conference champions and a runner up from the 2017 NBA Finals. On June 19, 2017, the Cavaliers general manager David Griffin agreed to leave the team. During July, Cleveland competed in the MGM Resorts Summer League in Las Vegas, winning 4 of 5 games. On July 24, 2017, the Cavaliers named Koby Altman as their new general manager. On August 22, 2017, the Cavaliers traded away Kyrie Irving to the rival Boston Celtics in exchange for Isaiah Thomas, Jae Crowder, Ante Žižić, and the rights to the Brooklyn Nets' first round pick in the 2018 NBA draft; the trade would later be expanded with the Cavaliers acquiring a 2020 second round pick from the Miami Heat eight days afterward due to concerns over the health of Thomas's hip. On September 28, during training camp, Dwyane Wade would sign a one-year deal with Cleveland. The Cavs will play the first regular season game of the year on October 17, 2017 against the Boston Celtics.
Document 7: NBA 2K18: NBA 2K18 is a basketball simulation video game developed by Visual Concepts and published by 2K Sports. It is the 19th installment in the "NBA 2K" franchise and the successor to "NBA 2K17". It was released in September 2017 for Microsoft Windows, Nintendo Switch, PlayStation 4, PlayStation 3, Xbox One, and Xbox 360. Kyrie Irving serves as cover athlete for the regular edition of the game, Shaquille O'Neal is the cover athlete for the special editions, and DeMar DeRozan of the Toronto Raptors is the cover athlete for the game in Canada. While a member of the Cleveland Cavaliers when selected for the cover, Irving was traded to the Boston Celtics prior to the game's release. As a result, a new cover depicting Irving in a Celtics uniform was revealed alongside the original cover.
Document 8: 2016–17 NBA season: The 2016–17 NBA season was the 71st season of the National Basketball Association. The regular season began on October 25, 2016, with the 2016 NBA champion Cleveland Cavaliers hosting a game against the New York Knicks. Christmas Day games were played on Sunday December 25, 2016. The 2017 NBA All-Star Game was played at the Smoothie King Center in New Orleans, Louisiana, on February 19, 2017, with the West defeating the East 192–182. Anthony Davis of the New Orleans Pelicans was named the All Star Game MVP after breaking Wilt Chamberlain's record by scoring 52 points in the All Star Game. The original host of the game, Charlotte's Spectrum Center, was removed as the host on July 21, 2016 due to the league's opposition against North Carolina's Public Facilities Privacy & Security Act. The regular season ended on April 12, 2017, and the playoffs began on April 15, 2017 and ended on June 12, 2017, with the Golden State Warriors going 16-1 in the playoffs and beating the Cleveland Cavaliers in five games during their third consecutive matchup in the NBA Finals.
Document 9: Boston Bruins: The Boston Bruins are a professional ice hockey team based in Boston, Massachusetts. They are members of the Atlantic Division of the Eastern Conference of the National Hockey League (NHL). The team has been in existence since 1924, and is the league's third-oldest team overall and the oldest in the United States. It is also an Original Six franchise, along with the Chicago Blackhawks, Detroit Red Wings, Montreal Canadiens, New York Rangers and Toronto Maple Leafs. The Bruins have won six Stanley Cup championships, tied for fourth most of all-time with the Blackhawks and tied second-most of any American NHL team also with the Blackhawks (behind the Red Wings, who have 11).
Document 10: 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.
Document 11: Los Angeles Lakers: The Los Angeles Lakers are an American professional basketball team based in Los Angeles. The Lakers compete in the National Basketball Association (NBA), as a member of the league's Western Conference Pacific Division. The Lakers play their home games at Staples Center, an arena shared with the NBA's Los Angeles Clippers, the Los Angeles Sparks of the Women's National Basketball Association, and the Los Angeles Kings of the National Hockey League. The Lakers are one of the most successful teams in the history of the NBA, and have won 16 NBA championships, their last being in 2010. As of 2017, the Lakers are the second most valuable franchise in the NBA according to "Forbes", having an estimated value of $3.0 billion.
Document 12: 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.
Document 13: 2013–14 NBA season: The 2013–14 NBA season was the 68th season of the National Basketball Association (NBA). The regular season began on Tuesday, October 29, 2013 with the Indiana Pacers hosting a game against the Orlando Magic followed by the 2012–13 NBA champions Miami Heat hosting a game against the Chicago Bulls followed by the Los Angeles Lakers hosting a game against the Los Angeles Clippers. The 2014 NBA All-Star Game was played on February 16, 2014, at the Smoothie King Center in New Orleans. Cleveland's Kyrie Irving won the NBA All-Star Game Most Valuable Player Award. The regular season ended on April 16, 2014, and the playoffs began on Saturday, April 19, 2014 and ended on June 15, 2014 with the San Antonio Spurs defeating the Miami Heat in five games to win the 2014 NBA Finals.
Document 14: List of Boston Celtics head coaches: The Boston Celtics are an American professional basketball team based in Boston, Massachusetts. They play in the Atlantic Division of the Eastern Conference in the National Basketball Association (NBA). The team is owned by Wycliffe Grousbeck and coached by Brad Stevens, with Danny Ainge as the general manager. Founded in 1946, their 17 NBA Championships are the most for any NBA franchise, and their eight consecutive NBA championships from 1959 to 1966 represent the longest consecutive championship winning streak of any North American professional sports team to date. They play their home games in the TD Garden.
Document 15: Los Angeles Lakers: The Los Angeles Lakers are an American professional basketball team based in Los Angeles. The Lakers compete in the National Basketball Association (NBA), as a member of the league's Western Conference Pacific Division. The Lakers play their home games at Staples Center, an arena shared with the NBA's Los Angeles Clippers, the Los Angeles Sparks of the Women's National Basketball Association, and the Los Angeles Kings of the National Hockey League. The Lakers are one of the most successful teams in the history of the NBA, and have won 16 NBA championships, their last being in 2010. As of 2017, the Lakers are the second most valuable franchise in the NBA according to "Forbes", having an estimated value of $3.0 billion.
ground_truth: October 17, 2017