1. I was at games 1 and 3 of the 1973 series vs. the Knicks. Game 3 was when Havlicek injured his right shoulder running into a Debusshere pick, causing him to shoot free throws with his left hand. We lost the game, and went on to lose the series in 7. It was the first time the Celtics lost a game 7 in Boston Garden. Game 4 was the first time I remember feeling that the refs stole won from the Celtics. We had a huge lead in MSG, about 16 going into the 4th quarter, yet lost, and believe me, the refs really helped the Knicks' cause in that one.
2. Was at game 1 of 1981 NBA finals, when Bird made the great shot behind the backboard to win it vs. the Houston Rockets. I was on that side of the court, although many rows up, and from that angle it was not that impressive a shot. When I later saw it on video, wow, I realized how great it was.
What I remember most about that game, however, was before it started, Bill Russell and Bob Cousy walked out onto the court and shook hands, and the Garden went wild. It was as if Russ and Cous were saying, "hey, we're back!!" For those who don't remember, the Celtics got to the 1981 finals in miraculous fashion, trailing the favored 76ers in the Eastern Conference finals, 3-1, and coming back to win the next three. It was a foregone conclusion that we would beat Houston, although they did put up a good fight, especially by winning game 2 in Boston.
I went to many other Celtic games in the 60's, 70's and early 80's. Then I left the area, and have fortunately been able to follow them with League Pass.