What happened to Easter and Ash Wednesday.

Easter and Ash Wednesday are not a US holidays. They are observances by Christians and Orthodox Christians, and Easter is observed on either April 1st or April 8th of this year respectively by those faiths.

webcal://files.apple.com/calendars/US32Holidays.ics

Installs on OS X but didn't work on my iPhone X.

Shows April 1 as Easter with 4 other holidays.

Ha-ha-ha but April fools day is a US holiday, 😕

Uh, no. It's not. Nobody gets a day off of work or anything special for April Fool's day. It's there for laughs, and that's about it.