Short answers, pulled from the story.
Boston Garden opened on the 17th of November, 1928. It was designed and built by boxing promoter Tex Rickard, who also built the third Madison Square Garden in New York, at a cost of $10 million, more than double the price of the New York arena built three years earlier. Rickard died just two months after the Garden opened, from a ruptured appendix, leaving Boston as his last completed project.
During the 1985-86 regular season, the Boston Celtics went 40-1 at home, setting the NBA record for home-court mastery. They also went undefeated at home through the playoffs that year. Combined with the following regular season, their Garden record over that stretch reached 79-3.
James Brown performed at the Boston Garden on the 5th of April, 1968, the night after Martin Luther King Jr. was assassinated. Mayor Kevin White appeared on stage and urged the audience to remain peaceful; WGBH-TV broadcast and then rebroadcast the concert twice that night. Brown's words and presence were credited with helping keep Boston calm while riots broke out in other cities.
The Garden's rink measured 58.2 by 25.3 meters, nine feet shorter and two feet narrower than a standard NHL surface. The NHL had no uniform rink standard when the building was constructed, so the ice matched the dimensions of the Boston Arena, the Bruins' previous home.
Boston Garden hosted its last official game on the 14th of May, 1995, and its final event on the 29th of September, 1995. The FleetCenter, its replacement, opened on the 30th of September, 1995. The Garden sat empty for three years before being demolished in 1998.
Led Zeppelin was banned in 1975 after fans who had been let into the lobby because of sub-freezing temperatures rioted, damaging the seating area, the ice surface, and the refreshment stands. Boston's mayor at the time canceled the upcoming show and banned the band from the building for five years.