[Drago]

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.

[Spktyr]

Turn US Holidays off (if you don’t have it off already) and then back on. Easter should reappear.

[LouieFisk]

“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.”
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Sounds like a buggy-type glitch to me. Maybe having to do with two “holidays” on April 1st caused a programming error impacting some users and not others.