In addition to the Hotchkiss match, in the 1943 Tri-State Championship Final, Pauline Betz d. C.Wolf 6-0 6-0 without losing a point.
On the men's side, at Sutton on April 9, 1946, J.E.Harper(Aus) d. J.Sandiford(GB) 6-0 6-0 in 18 minutes (!!), losing just a single point. It was Harper's 32nd birthday. (Maybe he was in a hurry to get to his party.)
In the Open era, there has been a golden set, by Bill Scanlon, in '83 or '84.
I would point out that in the pre-Open era, especially before, say, 1950, a lot of these "tournaments" were merely glorified exhibitions, whereby a club invited a "name" player to play, and filled the draw with club stiffs. This allowed the star to stroll through the tournament without much effort, thus leaving them with enough energy to play doubles and mixed as well (which they were often asked to do in return for their "expense money"). Also, the lack of challenging players in the field meant that the star attraction (and ticket seller) would be guaranteed to reach the final, and be more likely to return in the future. (As opposed to if they were made to work hard to win.)
It would be much like if your nearest tennis club invited a top 10 player to come and compete against the members. You could see plenty of Golden Sets, if the pro was in the mood to do so.