How to change the default Calendar alert to be an email instead of a message?

In Calendar on Yosemite, I want to change the default Calendar alert to an email. I know how to access the default calendar alerts, but those only allow me to change when the message alert pops up, not whether it's a message or an email. I'd rather not have to create a custom alert for every single calendar event I create.

I know I could use Google Calendar as my main calendar, as it allows me to configure the default alerts I want, but I'd to keep everything in my Mac Calendar.