Apple's native calendar app must be used to remove the alerts for an entire calendar.
How to remove Alerts for an Entire Calendar
- Open your device's native calendar app.
- Select Calendars at the bottom.
- Press (i) next to the calendar you want to edit.
- Toggle the Event Alerts switch.
Visual Guide
How to remove Alerts for an Entire Calendar
1. Open your device's native calendar app.
2. Select Calendars at the bottom.
3. Press the (i) next to the calendar that you want to edit.
4. Toggle the Event Alerts switch.