How do I find International women's day on Apple Calendar?

It never was: https://www.snopes.com/news/2025/03/07/international-womens-day-apple-google/

If you’d like it added: Product Feedback - Apple

Or connect to an available calendar with whichever holidays you want.

hadnama wrote:

where is international women's day on the Apple calendar?

[Re-Titled by Moderator]

You don't, it is not there. Subscribe to a calendar that recognize IWD as a holiday.