Configure Apple Mail to always open calendar invites in Fantastical 2 How can I configure Apple Mail to always open calendar invites in Fantastical 2?

Typically in OS X dialogs, you'd:


Right click on file
Select Open With...
Choose the application
Select Always open files of this type option


However, this option isn't available in the Mail dialog.

How do I set this preference?
The OS X Default calendar app preference is set in Calendar.app's preferences. If you select Fantastical there it should yield the behavior you are looking for. 

Calendar.app > Calendar > Preferences > General > Default Calendar App