I created a calendar event under the "Personal" calendar, which was a mistake.
I attempted to move the calendar event to my email calendar by finding the event, then clicking on "Edit" then clicking on the drop-down at the top of the "Edit" window where it currently says "Personal".
After that, I clicked on the email calendar (google calendar) that I wanted to move it to. Then I clicked done, then the calendar app froze and refused to respond. I tried this multiple times with the same result.
One time, it didn't crash, but it also didn't change the save location of the event. I tried it again, right after that, and it crashed again.