As far as I can tell, the world record for the most voluntary vasectomies performed in a single day (and at a single event) was set on December 5, 1987 in Bangkok, when 1214 men received the operation. This beat the previous record of 1202, set in 1983.
Interesting how the article specifies these were voluntary vasectomies. Is there a separate record for involuntary ones?
Anyway, 'most vasectomies' appears to be a category that Guinness doesn't bother to cover.

Des Moines Register - Dec 6, 1987
Alas, this positive sign was not an accurate forecast of
the fate of William Schroeder.
Article source.
As far as I can tell, their claim to this record remains unchallenged.

Palm Beach Post - Nov 1, 1997
“During the procedures at the hospital, the blind doctor depended on nurses and other physicians to make decisions requiring eyesight.”
So, how many decisions during surgery don't require eyesight?

Philadelphia Daily News - Mar 2, 1984

Rochester Democrat and Chronicle - Aug 26, 1984
Back in 1881, Dr. Thomas Dwight of Harvard Medical School authored
Frozen Sections of a Child, which sounds like the kind of book one might find in the library of a serial killer. As the title indicated, the book consisted of anatomical illustrations of frozen cross-sections of a three-year-old child.
In the preface, Dwight helpfully included advice for those readers who might want to create their own frozen sections of a child:
My experience with frozen sections enables me to offer the following directions for making them. First, be very sure that the body, or part, to be frozen is in precisely the position you desire, and that there are no folds or indentations in the skin. I always use natural cold when possible. Weather much about zero (Fahrenheit) is unsatisfactory; but if the part is thoroughly chilled by several days' exposure to a pretty low temperature, a night of 10° may possibly finish it. Salt and ice, or snow, no doubt, will answer the purpose, but much time and patience are required. It is essential that the melted ice should have a chance to run off. The body should be frozen like a rock—so much so that the operator cannot tell whether he is cutting bone or muscle. Tooth is the only tissue he should be able to recognize. The sections should be made in a cold room, with a very sharp saw that has been chilled. When a section is cut, its surface is obscured by a thick half-frozen saw-dust, which is doubly thick if the freezing is not quite sufficient. It is wisest, if time allows, to remove this at once, which is done by pouring a little hot water over the section and brushing or scraping it off rapidly and carefully. This is a very delicate part of the process, and its successful performance has much to do with the beauty of the specimen. If it is to be kept, it should be laid on a piece of glass or wood, and placed at once, while still frozen, in cold alcohol.
More details:
Harvard's Countway Library. You can also read the full book online via
Google Books.
The Brith Milah School, established at New York’s Mount Sinai Hospital in 1968, was the world’s first-ever (and only?) school for circumcision training. It was a two-year program followed by a one-year internship. (Seems like a lot of training for a relatively simple operation. Though I guess it's important not to mess it up.)
The first class graduated in 1970, but by the 1980s the school evidently no longer existed. According to
a 1989 story on JTA (Jewish Telegraphic Agency) it “ran into problems when it could not get malpractice insurance for trainees who were not physicians.”

Wisconsin Jewish Chronicle - Mar 22, 1968

Wisconsin Jewish Chronicle - Dec 25, 1970
I'm guessing the 50/50 chance didn't go in his favor.

Marion Star - Dec 28, 1995
This new book about the "Anatomical Venus" looks to be fascinatingly weird. Lots more photos at the link.
Handy in or out of the operating room.
Order Yours Here