How to change Thanksgiving date on Siri?

You can add a Holidays calendar for different countries or regions. In the Calendar app on your Mac, choose File > New Holiday Calendar. Click the Region pop-up menu, choose a country or region, then click Add.

If your OS is too old..

Add Canadian holidays to your calendar

There are 2 ways to add holidays to your calendar:

• Adding a “remote calendar” URL that will keep itself updated.
• Downloading the holidays locally and importing them into your preferred calendar program.

Import holidays with “remote calendar” URL

If you use Outlook, iCal, or Google Calendar, you can import holidays directly from a URL. Holidays for 2023 will be added immediately and 2024’s will be added automatically before the end of the year.

If you only want holidays for your region, replace your two-character regional code (eg, “AB”, “ON”) with your province or territory.

Canadahttps://canada-holidays.ca/icsAlbertahttps://canada-holidays.ca/ics/ABOntariohttps://canada-holidays.ca/ics/ONetc.https://canada-holidays.ca/ics/[regionID]

https://canada-holidays.ca/add-holidays-to-calendar

Didn't work for me, but I'm not Canadian... lol. :)