How do I unsubscribe from a calendar (i.e. delete a calendar subscription)?

On the home screen of the device, tap Calendar.

Turn the device to portrait orientation and scroll down.

If you see Accounts & Passwords (instead of just Passwords), select Accounts & Passwords and jump to Step 4.

Otherwise, select Calendar and proceed.

Tap Accounts.

Tap Subscribed Calendars.

Tap the calendar you wish to remove.

Tap Delete Account.

Tap Delete Account.