There's no need to stop using Google Calendar (Android App) because you stopped using Google Calendar (provider) if that's what you prefer, it'll let you view c

There's no need to stop using Google Calendar (Android App) because you stopped using Google Calendar (provider) if that's what you prefer, it'll let you view calendars from any provider installed on your phone. Fastmail themselves recommend DAVx to sync with your Fastmail account for this purpose (https://www.fastmail.help/hc/en-us/articles/1500000279881-Set-up-Fastmail-on-Android#calendar https://www.fastmail.help/hc/en-us/articles/1500000279881-Se...), though it would be nice if Fastmail's own app integrated with the OS a bit more in terms of providing a calender to the OS, and having widgets for mail folders.