also interesting is looking at the next lowest frequency dates-- all of them are clustered around major holidays:

365 12 25

364 1 1

363 12 24

362 1 2

361 7 4

360 12 26

359 11 28

358 11 27

357 11 26

356 1 3

355 10 31

354 12 23

353 11 25

352 11 24

Not sure if this is the (whole) reason, but obviously no one is going to have a scheduled induction or C-section on a holiday.

These days it doesn't surprise me, it seems like doctors are willing to induce at the drop of the hat these days. So why not to keep their holiday clear.