The search function in the Calendar app would be improved by allowing unaccented (and incorrectly accented) search characters.
E.g. Search term à should return ā, ä, a, å, ą etc etc (but with à prioritised)
Zoë or Zoe? One search should suffice. This would be a good standard across many apps, though I’ve not tested them.
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You’d need to take this up with the upstream Etar issues (didn’t come up yet). Etar searches the android calendar provider (it’s backend really).
When filing a bug, you can state to look for a “collate”/“collation” option to also match diacritics/accents. There’s a “Collator” class in Android text utils for this and I see an online example that uses it.
The Contacts App (also relying on android content provider) will return accented letters when searched without and it uses that class.