Though they used do these two-game sets vs the Knicks over a weekend in the early 70's, those were home & home and only scheduled once (?) each season. Plus at that time, the Celts/Knicks were the two best teams in the league and those games were huge.
The twin games vs various teams they put in the schedule now are like baseball double-headers, very hard to sweep.
Celts did well to get these two wins against a decent team. I sure would like to give Orlando the same treatment.