Fantastical: how to add alerts/reminders in text
From the same blog post:


  If you’d like to force Fantastical to create a reminder regardless of what you enter, you can start a sentence with “reminder”, “todo”, “task”, or “√” (⌥ option + V).


Also…


  You can quickly set the priority of a new reminder by adding exclamation points to the end of your reminder. More exclamation points will increase the priority of the reminder.