If you are getting a message in AltaMail about calendar access or you can't see any events, then you need to check your device access settings.

If your calendar is not displaying in AltaMail, tap on the app settings cog button inside of AltaMail. Open the Calendar section - Calendars. Make sure your calendars are selected.

Also open the Apple iPad/iPhone "Settings" app > Privacy > Calendars > AltaMail. Check that AltaMail is set to "on".

Also tap into the Settings app > Scroll near the bottom and click on our AltaMail. Turn on "Calendars".