Jewish American History Month

Only Apple (or whoever wrote the holiday calendar you're using) could tell you why that have chosen the holidays they have.

You can certainly let Apple know your thoughts here:

Product Feedback - Apple

You can also subscribe to a different holiday calendar or create your own.

Create Your Own Holiday Calendar From A S… - Apple Community

My US Holidays calendar doesn't list either of them on iPhone or Mac. The exact calendar you are using shows on the Mac when you tap the icon to the right of the US Holidays. Mine shows as the "us_en.us" calendar, but yours may be different if the region/language is not the same. Is this the only calendar you are syncing?

Although Idris provides the best solution by using Feedback or creating you own calendar, just curious if yours is different than mine.

Mac Jim ID wrote:

My US Holidays calendar doesn't list either of them on iPhone or Mac. The exact calendar you are using shows on the Mac when you tap the icon to the right of the US Holidays. Mine shows as the "us_en.us" calendar, but yours may be different if the region/language is not the same. Is this the only calendar you are syncing?

Although Idris provides the best solution by using Feedback or creating you own calendar, just curious if yours is different than mine.

Mine shows Asian Pacific American Heritage Month.

The U.S. Holidays calendar I subscribe to is:

https://p04-calendars.icloud.com/holiday/US_en.ics

My result is the same as yours (Mac Jim ID).

In fact, my calendar shows no celebratory months whatsoever.

I stand corrected. Apparently, I have multiple holiday calendars. The Asian Pacific American Heritage Month event is from my work Google holiday calendar.

I almost never look at Calendar on my Mac but it's much easier to tell there because if you tap on the event, the calendar is highlighted in the sidebar.

sberman wrote:

In fact, my calendar shows no celebratory months whatsoever.

Yep, same here. I believe the OP is syncing from other calendar sources such as Gmail(Google) or Exchange(Microsoft).