Just figured out how to. The only way to get rid of these newly added holidays showing On the Apple calendar is to Unsubribe/uncheck the Apple ‘US Holidays’ that now comes standard in IOS apparently, and then subscribe to a 3rd party calender that doesn't have every holiday throughout the world. My only interest in doing this was to have the minimal standard Holidays on the calender that would usually involve: time off for work, restaurant closures, bank closures, ect. I would think most agree the new PC (political correct) Apple calender makes it inconvenient and clutters things up, esp. on the iPhone, trying to see what that dot means only to find it has no relevance to the days activities. Here’s a solution on how to fix for now if anybody is interested.
1) On the IOS device>select the Calender App>select Calenders at bottom>uncheck US Holidays-all US holidays will now be removed from showing on your Calender.
2)
Copy:
webcal://www.calendarlabs.com/ical-calendar/ics/76/US_Holidays.ics
then Email the link (or another3rd party calender link of your choice) to the IOS device you want to add it to. Click the new US calender link from your email and IOS will give an option to add to calender. Add the calender. And that is it, new calender will show with the ‘standard USobserved holidays’ as in past generations of IOS Calenders.
Hope this helps others.