The only way Easter doesn't show up is if you don't have US Holidays turned on.
“Fake news.”
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As I posted above, it’s users who are complaining about it on Apple’s official forum. If the fix were simple, it’s odd that Apple wouldn’t want to address it ASAP in some official way. Late/No response is a bad response (and bad PR).
Easter is gone off my Mac (HS v.10.13.2) calendar and my iPhone 7 calendar (iOS v.11.2.5). “Indigenous People’s Day” is there but Columbus Day is also there.
I just updated and my April first only has April fools. No Easter. Its set to us holidays. I checked my iPad as well and it also is set to us holidays and Easter and Good Friday are gone. Im running 11.2.6.