default calendar for adding events from mail

I've been looking for this information too! I've tried making my iCloud account default (and at the top) of every list and option on my Mac, and yet Apple Mail always defaultly adds appointments to my Gmail calendar. Did you figure out a solution?

Try

https://discussions.apple.com/thread/2605242?answerId=12545389022#12545389022

it doesn't provide the best solution though...

I had the same problem and I think I found the solution. When you click the event in Mail, you are given a dialogue box that shows you the event in your calendar. At the top of the box are two options; "Edit" or "Add to iCal". Previously I had been selecting "Add to iCal" and it would put it into a calendar that was not my iCal default calendar. I'd then need to change the calendar by changing the event in iCal. When I instead click "Edit" in that Mail dialogue box I can change the calendar in Mail to my default calendar. Now when I click on other events in Mail it is automatically going to the default calendar. In short, it will use the last calendar that you've selected from that Edit box.

I don't see the "edit" button in my version, but I found another solution: after you click "Add to iCal" you get a dialogue box allowing you to select various info for that event. Go to "calendar" and change it to the calendar you want. From then on, whenever you "Add to iCal," it will use that calendar as the default.